phân tích thành nhân tử
a)4x^2-12x+9-3(2x-3)(x+1)
b)25-42^2+8xy-4y^2
c)x^3-5x^2+4x-2(x^2-x)
d) 4(x-2)^2-5(x-2)+1
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phân tích đa thức thành nhân tử
a)8x^3+27
b) 4x^2-4x+1-y^2
c) x^4-2x^3+x^2-2x
d) x^2-4y^2+2x+4y
a) \(8x^3+27=\left(2x+3\right)\left(4x^2-6x+9\right)\)
b) \(4x^2-4x+1-y^2=\left(2x-1\right)^2-y^2=\left(2x-1-y\right)\left(2x-1+y\right)\)
c) \(x^4-2x^3+x^2-2x=x^3\left(x-2\right)+x\left(x-2\right)=x\left(x-2\right)\left(x^2-1\right)=x\left(x-2\right)\left(x-1\right)\left(x+1\right)\)
d) \(x^2-4y^2+2x+4y=\left(x-2y\right)\left(x+2y\right)+2\left(x+2y\right)=\left(x+2y\right)\left(x-2y+2\right)\)
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Phân tích đa thức 8𝑥 3 -1 thành nhân tửA.(2𝑥 − 1)(4𝑥 2+2x+1)B.(2𝑥 + 1)(4𝑥 2+2x+1)C.(2𝑥 − 1)(4𝑥 2 - 2x+1)D.(2𝑥 − 1)(4𝑥 2+4x+1)Câu 17 Phân tích đa thức 5x2 -4x +10xy-8y thành nhân tửA..(5x-4)(x-2y)B. (x+2y)(5x-4)C.(5x-2y)(x+4y)D.(5x+4)(x-2y)Câu 18 Phân tích đa thức 8x3 + 12x2y + 6xy2 + y3 thành nhân tử :A. (2x + y)3B.(2x - y)3C. (2x + y3 ) 3D. (2x3 + y)3Câu 19 Tìm x, biết (x + 2) . ( x – 1 ) – x 2 –1A. x –2 4B. x 2C. x 1D. x –1Câu 20 Tìm x biết x . ( x – 3) x2 + 6A. x 2B. x –2C. x 4D. x...
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Phân tích đa thức 8𝑥 3 -1 thành nhân tử
A.(2𝑥 − 1)(4𝑥 2+2x+1)
B.(2𝑥 + 1)(4𝑥 2+2x+1)
C.(2𝑥 − 1)(4𝑥 2 - 2x+1)
D.(2𝑥 − 1)(4𝑥 2+4x+1)
Câu 17 Phân tích đa thức 5x2 -4x +10xy-8y thành nhân tử
A..(5x-4)(x-2y)
B. (x+2y)(5x-4)
C.(5x-2y)(x+4y)
D.(5x+4)(x-2y)
Câu 18 Phân tích đa thức 8x3 + 12x2y + 6xy2 + y3 thành nhân tử :
A. (2x + y)3
B.(2x - y)3
C. (2x + y3 ) 3
D. (2x3 + y)3
Câu 19 Tìm x, biết (x + 2) . ( x – 1 ) – x 2 = –1
A. x = –2 4
B. x = 2
C. x = 1
D. x = –1
Câu 20 Tìm x biết x . ( x – 3) = x2 + 6
A. x = 2
B. x = –2
C. x = 4
D. x = 6
Câu 21 Tìm x biết : (𝑥 + 3)(𝑥 − 3) − 𝑥(𝑥 − 3) =0
A. x = 3.
B. x= -3
C. x=1
D. x=0
\(16,A\\ 17,C\\ 18,A\\ 19,C\\ 20,A\\ 21,A\)
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bài 1 phân tích đa thức thành nhân tửa)3x(x-7)+2xy-14yb)9(2x-5)^2+15x-6x^2c)6x^2 -12x+6d)-20x^2+60xy-45y^2e)2xy^3-16x^4f)3x^4-48g)x^2-z^2+4xy+4y^2h)x^2-z^2+2xy-6zt+y^2-9t^2baif2 pt đa thức thanhhf nhân tửa)x^2-12x+20b)2x^2-x-15c)x^3-x^2+x-1d)2x^3-5x-6e)4y^4+1f)x^7+x^5+x^3g)(x^2+x)^2-5(x^2+x)+6h)(x^2+2x)^2-2(x+1)^2-1i)x^2+4xy+4y^2-4(x+2y)+3j)x(x+1)(x+2)(x+3)-3
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bài 1 phân tích đa thức thành nhân tử
a)3x(x-7)+2xy-14y
b)9(2x-5)^2+15x-6x^2
c)6x^2 -12x+6
d)-20x^2+60xy-45y^2
e)2xy^3-16x^4
f)3x^4-48
g)x^2-z^2+4xy+4y^2
h)x^2-z^2+2xy-6zt+y^2-9t^2
baif2 pt đa thức thanhhf nhân tử
a)x^2-12x+20
b)2x^2-x-15
c)x^3-x^2+x-1
d)2x^3-5x-6
e)4y^4+1
f)x^7+x^5+x^3
g)(x^2+x)^2-5(x^2+x)+6
h)(x^2+2x)^2-2(x+1)^2-1
i)x^2+4xy+4y^2-4(x+2y)+3
j)x(x+1)(x+2)(x+3)-3
2:
a: \(x^2-12x+20\)
\(=x^2-2x-10x+20\)
=x(x-2)-10(x-2)
=(x-2)(x-10)
b: \(2x^2-x-15\)
=2x^2-6x+5x-15
=2x(x-3)+5(x-3)
=(x-3)(2x+5)
c: \(x^3-x^2+x-1\)
=x^2(x-1)+(x-1)
=(x-1)(x^2+1)
d: \(2x^3-5x-6\)
\(=2x^3-4x^2+4x^2-8x+3x-6\)
\(=2x^2\left(x-2\right)+4x\left(x-2\right)+3\left(x-2\right)\)
\(=\left(x-2\right)\left(2x^2+4x+3\right)\)
e: \(4y^4+1\)
\(=4y^4+4y^2+1-4y^2\)
\(=\left(2y^2+1\right)^2-\left(2y\right)^2\)
\(=\left(2y^2+1-2y\right)\left(2y^2+1+2y\right)\)
f; \(x^7+x^5+x^3\)
\(=x^3\left(x^4+x^2+1\right)\)
\(=x^3\left(x^4+2x^2+1-x^2\right)\)
\(=x^3\left[\left(x^2+1\right)^2-x^2\right]\)
\(=x^3\left(x^2-x+1\right)\left(x^2+x+1\right)\)
g: \(\left(x^2+x\right)^2-5\left(x^2+x\right)+6\)
\(=\left(x^2+x\right)^2-2\left(x^2+x\right)-3\left(x^2+x\right)+6\)
\(=\left(x^2+x\right)\left(x^2+x-2\right)-3\left(x^2+x-2\right)\)
\(=\left(x^2+x-2\right)\left(x^2+x-3\right)\)
\(=\left(x^2+x-3\right)\left(x+2\right)\left(x-1\right)\)
h: \(\left(x^2+2x\right)^2-2\left(x+1\right)^2-1\)
\(=\left(x^2+2x+1-1\right)^2-2\left(x+1\right)^2-1\)
\(=\left[\left(x+1\right)^2-1\right]^2-2\left(x+1\right)^2-1\)
\(=\left(x+1\right)^4-2\left(x+1\right)^2+1-2\left(x+1\right)^2-1\)
\(=\left(x+1\right)^4-4\left(x+1\right)^2\)
\(=\left(x+1\right)^2\left[\left(x+1\right)^2-4\right]\)
\(=\left(x+1\right)^2\left(x+1+2\right)\left(x+1-2\right)\)
\(=\left(x+1\right)^2\cdot\left(x+3\right)\left(x-1\right)\)
i: \(x^2+4xy+4y^2-4\left(x+2y\right)+3\)
\(=\left(x+2y\right)^2-4\left(x+2y\right)+3\)
\(=\left(x+2y\right)^2-\left(x+2y\right)-3\left(x+2y\right)+3\)
\(=\left(x+2y\right)\left(x+2y-1\right)-3\left(x+2y-1\right)\)
\(=\left(x+2y-1\right)\left(x+2y-3\right)\)
j: \(x\cdot\left(x+1\right)\left(x+2\right)\left(x+3\right)-3\)
\(=\left(x^2-3x\right)\left(x^2-3x+2\right)-3\)
\(=\left(x^2-3x\right)^2+2\left(x^2-3x\right)-3\)
\(=\left(x^2-3x+3\right)\left(x^2-3x-1\right)\)
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13 tháng 8 2023 lúc 18:18
Phân tích các đa thức sau đây thành nhân tử
a, 36x^2 - ( 3x -2 ) ^2
b, 16(4x+5)^5 - 25 (2x+2)^2
c, ( x - y + 4 )^2
d, (x+1)^4 - (x-1)^4
e, 16x^2 - 24xy + 9y^2
f, -x^4/4 + 2x^2y^3 - 4y^6
g , 64x^3 +1
h, x^3y^6z^9 - 125
k, 27x^6 - 8x^3
I , x^6 - y^6
m, 27x^3 - 54x^2y + 36xy^2 - 8y^3
n, y^9 - 9x^2y^6 + 27x^4y^3 - 27x^6
làm ơn giải chi tiết giúp mik vs ạ , cảm ơn
a: =(6x)^2-(3x-2)^2
=(6x-3x+2)(6x+3x-2)
=(9x-2)(3x+2)
d: \(=\left[\left(x+1\right)^2-\left(x-1\right)^2\right]\left[\left(x+1\right)^2+\left(x-1\right)^2\right]\)
\(=4x\cdot\left[x^2+2x+1+x^2-2x+1\right]\)
=8x(x^2+1)
e: =(4x)^2-2*4x*3y+(3y)^2
=(4x-3y)^2
f: \(=-\left(\dfrac{1}{4}x^4-2\cdot\dfrac{1}{2}x^2\cdot2y^3+4y^6\right)\)
\(=-\left(\dfrac{1}{2}x^2-2y^3\right)^2\)
g: =(4x)^3+1^3
=(4x+1)(16x^2-4x+1)
k: =x^3(27x^3-8)
=x^3(3x-2)(9x^2+6x+4)
l: =(x^3-y^3)(x^3+y^3)
=(x-y)(x+y)(x^2-xy+y^2)(x^2+xy+y^2)
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Phân tích các đa thức sau thành nhân tửa) ^{ }3xy-6xy^2 b) ^{ }3x^3+6x^2+3xc) ^{ }x^3-x^2+2d) ^{ }x^2+4x+4-y^2e) ^{ }x^3+4x^2+4xf) ^{ }x^2+2x+1-9y^2g) ^{ }6x^2-12xh) ^{ }x^3+2x^2-xi) ^{ }x^2-2xy+y^2-9j) ^{ }x^2+x-6k) ^{ }2x^3+2x^2y-4xy^2l) ^{ }x^3-4x^2-12x+27
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Phân tích các đa thức sau thành nhân tử
a) \(^{ }3xy-6xy^2\)
b) \(^{ }3x^3+6x^2+3x\)
c) \(^{ }x^3-x^2+2\)
d) \(^{ }x^2+4x+4-y^2\)
e) \(^{ }x^3+4x^2+4x\)
f) \(^{ }x^2+2x+1-9y^2\)
g) \(^{ }6x^2-12x\)
h) \(^{ }x^3+2x^2-x\)
i) \(^{ }x^2-2xy+y^2-9\)
j) \(^{ }x^2+x-6\)
k) \(^{ }2x^3+2x^2y-4xy^2\)
l) \(^{ }x^3-4x^2-12x+27\)
a) \(3xy-6xy^2=3xy\left(1-2y\right)\)
b) \(3x^3+6x^2+3x=3x\left(x^2+2x+1\right)=3x\left(x+1\right)^2\)
c) \(x^3-x^2+2\)
d) \(x^2+4x+4-y^2=\left(x^2+4x+4\right)-y^2=\left(x+2\right)^2-y^2=\left(x-y+2\right)\left(x+y+2\right)\)
e) \(x^3+4x^2+4x=x\left(x^2+4x+4\right)=x\left(x+2\right)^2\)
f) \(x^2+2x+1-9y^2=\left(x+1\right)^2-\left(3y\right)^2=\left(x-3y+1\right)\left(x+3y+1\right)\)
g) \(6x^2-12x=6x\left(x-2\right)\)
h) \(x^3-2x^2+x=x\left(x^2-2x+1\right)=x\left(x-1\right)^2\)
i) \(x^2-2xy+y^2-9=\left(x-y\right)^2-3^2=\left(x-y-3\right)\left(x-y+3\right)\)
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k) \(2x^3+2x^2y-4xy^2=2x\left(x^2+xy-2y^2\right)\)
l) \(x^3-7x^2+9x+3x^2-21x+27=x\left(x^2-7x+9\right)+3\left(x^2-7x+9\right)=\left(x+3\right)\left(x^2-7x+9\right)\)
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14 tháng 11 2021 lúc 16:38
Bài 1:phân tích đa thức thành nhân tử a) 9x²y+15xy²-3x b) 3z(z-2)+5(2-z) c) x²+4xy-42²+4y² d) x²+2x-15 Bài 2:tìm x a) x²-4x=0 b) (2x+2)-4x(x+3)=9 c) x²-12x=-36 HELP MEEEEEEE !!!
Bài 1:
\(a,=3x\left(3xy+5y-1\right)\\ b,=\left(z-2\right)\left(3z-5\right)\\ c,=\left(x+2y\right)^2-4z^2=\left(x+2y+2z\right)\left(x+2y-2z\right)\\ d,=x^2-3x+5x-15=\left(x-3\right)\left(x+5\right)\)
Bài 2:
\(a,\Leftrightarrow x\left(x-4\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\\ b,\Leftrightarrow2x+2-4x^2-12x=9\\ \Leftrightarrow4x^2+10x+7=0\\ \Leftrightarrow4\left(x^2+\dfrac{5}{2}x+\dfrac{25}{16}\right)+\dfrac{3}{4}=0\\ \Leftrightarrow4\left(x+\dfrac{5}{6}\right)^2+\dfrac{3}{4}=0\left(vô.lí\right)\\ \Leftrightarrow x\in\varnothing\\ c,\Leftrightarrow x^2-12x+36=0\\ \Leftrightarrow\left(x-6\right)^2=0\\ \Leftrightarrow x=6\)
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bài 1: phân tích các đa thức thành nhân tử:
a)x(3-4x)+5(3-4x)
b)2y(5y-6)-4(6-5y)
c)27(x-2)^3-3x(2-x)^2
d)6y(x^2-y^2)-8y(x+y)^2
bài 2:
a)2x^2-xy+2xz-yz
b)x^2-x+2y-4y^2
c)y^2+10y-9z^2+25
d) (x+2y)^3-x^2+4y^2
giúp mik nhé mik cần gấp ạ
2:
a: \(=\left(2x^2-xy\right)+\left(2xz-yz\right)\)
\(=x\left(2x-y\right)+z\left(x-2y\right)=\left(x-2y\right)\left(x+z\right)\)
b: \(=\left(x^2-4y^2\right)-\left(x-2y\right)\)
\(=\left(x-2y\right)\left(x+2y\right)-\left(x-2y\right)\)
\(=\left(x-2y\right)\left(x+2y-1\right)\)
c: \(=\left(y^2+10y+25\right)-9z^2\)
\(=\left(y+5\right)^2-\left(3z\right)^2\)
\(=\left(y+5+3z\right)\left(y+5-3z\right)\)
d: \(=\left(x+2y\right)^3-\left(x-2y\right)\left(x+2y\right)\)
\(=\left(x+2y\right)\left[\left(x+2y\right)^2-\left(x-2y\right)\right]\)
\(=\left(x+2y\right)\left(x^2+4xy+4y^2-x+2y\right)\)
1:
a: \(x\left(3-4x\right)+5\left(3-4x\right)=\left(3-4x\right)\left(x+5\right)\)
b: \(2y\left(5y-6\right)-4\left(6-5y\right)\)
\(=2y\left(5y-6\right)+4\left(5y-6\right)\)
\(=2\left(5y-6\right)\left(y+2\right)\)
c: \(=27\left(x-2\right)^3-3x\left(x-2\right)^2\)
\(=3\left(x-2\right)^2\cdot\left[9\left(x-2\right)-x\right]\)
\(=3\left(x-2\right)^2\left(8x-18\right)=6\left(x-2\right)^2\cdot\left(4x-9\right)\)
d: \(=6y\left(x-y\right)\left(x+y\right)-8y\left(x+y\right)^2\)
\(=2y\left(x+y\right)\left[3\left(x-y\right)-4\left(x+y\right)\right]\)
\(=2y\left(x+y\right)\left(3x-3y-4x-4y\right)\)
\(=2y\left(x+y\right)\left(-x-7y\right)\)
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Bài 1
a) x(3 - 4x) + 5(3 - 4x)
= (3 - 4x)(x + 5)
b) 2y(5y - 6) - 4(6- 5y)
= 2y(5y - 6) + 4(5y - 6)
= (5y - 6)(2y + 4)
= 2(5y - 6)(y + 2)
c) 27(x - 2)³ - 3x(2 - x)²
= 27(x - 2)³ - 3x(x - 2)²
= 3(x - 2)²[9(x - 2) - x]
= 3(x - 2)²(9x - 18 - x)
= 3(x - 2)²(8x - 18)
= 6(x - 2)²(4x - 9)
d) 6y(x² - y²) - 8y(x + y)²
= 6y(x - y)(x + y) - 8y(x + y)²
= 2y(x + y)[3(x - y) - 4(x + y)]
= 2y(x + y)(3x - 3y - 4x - 4y)
= 2y(x + y)(-x - 7y)
= -2y(x + y)(x + 7y)
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Phân tích đa thức thành nhân tửa.16x^3+0,25yz^3b.x^4-4x^3+4x^2c.x^3+x^2y-xy^2-y^3d.x^3+x^2+x+1e.x^4-x^2+2x-1f.2x^2-18g.x^2+8x+7h.x^4y^4+4i.x^4+4y^4k.x^2-2x-15
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Phân tích đa thức thành nhân tử
a.\(16x^3+0,25yz^3\)
b.\(x^4-4x^3+4x^2\)
c.\(x^3+x^2y-xy^2-y^3\)
d.\(x^3+x^2+x+1\)
e.\(x^4-x^2+2x-1\)
f.\(2x^2-18\)
g.\(x^2+8x+7\)
h.\(x^4y^4+4\)
i.\(x^4+4y^4\)
k.\(x^2-2x-15\)
a: \(16x^3+0,25yz^3\)
\(=0,25\cdot x^3\cdot64+0,25\cdot yz^3\)
\(=0,25\left(64x^3+yz^3\right)\)
b: \(x^4-4x^3+4x^2\)
\(=x^2\cdot x^2-x^2\cdot4x+x^2\cdot4\)
\(=x^2\left(x^2-4x+4\right)=x^2\left(x-2\right)^2\)
c: \(x^3+x^2y-xy^2-y^3\)
\(=x^2\left(x+y\right)-y^2\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2-y^2\right)\)
\(=\left(x+y\right)\left(x-y\right)\left(x+y\right)\)
\(=\left(x-y\right)\cdot\left(x+y\right)^2\)
d: \(x^3+x^2+x+1\)
\(=x^2\left(x+1\right)+\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2+1\right)\)
e: \(x^4-x^2+2x-1\)
\(=x^4-\left(x^2-2x+1\right)\)
\(=x^4-\left(x-1\right)^2\)
\(=\left(x^2-x+1\right)\left(x^2+x-1\right)\)
f: \(2x^2-18\)
\(=2\cdot x^2-2\cdot9\)
\(=2\left(x^2-9\right)=2\left(x-3\right)\left(x+3\right)\)
g: \(x^2+8x+7\)
\(=x^2+x+7x+7\)
\(=x\left(x+1\right)+7\cdot\left(x+1\right)=\left(x+1\right)\left(x+7\right)\)
h: \(x^4y^4+4\)
\(=x^4y^4+4x^2y^2+4-4x^2y^2\)
\(=\left(x^2y^2+2\right)^2-\left(2xy\right)^2\)
\(=\left(x^2y^2+2-2xy\right)\left(x^2y^2+2+2xy\right)\)
i: \(x^4+4y^4\)
\(=x^4+4x^2y^2+4y^4-4x^2y^2\)
\(=\left(x^2+2y^2\right)^2-\left(2xy\right)^2\)
\(=\left(x^2-2xy+2y^2\right)\left(x^2+2xy+2y^2\right)\)
k: \(x^2-2x-15\)
\(=x^2-5x+3x-15\)
\(=x\left(x-5\right)+3\left(x-5\right)=\left(x-5\right)\left(x+3\right)\)
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phân tích đa thức thành nhân tử
1)ab(a+b)-2bc(b-2c)-2ca(a-2c)-4abc
2)a^2b+2ab^2+4b^2c+4bc^2+2c^2a+ca^2+4abc
3)(x^2-6x+5)(x^2-10x+21)-20
4)4(x^2+x+1)^2+5x(x^2+x+1)+x^2
5)x^4+5x^3-12x^2+5x+1
6)(x+1)(x-4)(x+2)(x-8)+4x^2
7)4x^3+5x^2+10x-12
8)(x+3)^2(3x+8)(3x+10)-8
9)(4x+1)(12x-1)(3x+2)(x+1)-4
