a) (x^3 - 2y)^3
b) (x-3y) (x^2 + 3xy +9y^2)
Những câu hỏi liên quan
1) x^2-4xy-x+3y^2+3y
2) 6x^2+xy -7x-2y^2+7y-5
3) 2a^2+5ab-3b^2-7b-2
4) 6x^2-xy-2y^2+3x-2y
5) 2x^2 - 3xy-4x-9y^2-6y
Giúp mk với mk đang cần gấp
1: \(=\left(x-3y\right)\left(x-y\right)-\left(x-3y\right)=\left(x-3y\right)\left(x-y-1\right)\)
4: \(=6x^2-4xy+3xy-2y^2+3x-2y\)
\(=\left(3x-2y\right)\left(2x+y\right)+3x-2y=\left(3x-2y\right)\left(2x+y+1\right)\)
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Bai 1 TINH
a) x ^2 . x -2x^3
b) 6 x^2y . 3xy - 2y^2.x +y
C) 4x^2 +5x -1 .2x^3 -3x
d)-8x^3y + 2y^4 . 3xy^3 - 2x^4 +7y^4
GIUP MINH NHÀ
cho x\(\dfrac{x^2-15yz}{a}=\dfrac{9y^2-5xz}{3b}=\dfrac{15z^2-3xy}{5c}chứngminhràng:\dfrac{a^2-15bc}{x}=\dfrac{9b^2-5ac}{3y}=\dfrac{25c^2-3ab}{5z}\)
chứng minh ràng nếu (x^2-15yz)/(a)=(9y^2-15xz)/(3b)=(15z^2-3xy)/(5c) thì (a^2-15bc)/(x)=(9b^2-15ac)/(3y)=(15c^2-3ab)/(5z)
(2xy: x^2 - y^2 + x-y : 2x + 2y) : x+y:2x + y:y-x
x^2+3xy: x^2 - 9y^2 + 2x^2 - 5xy- 3y^2 : 6xy - x^2- 9y^2 - x^2+ xz + xy + yz: 3yz - x^2 - xz + 3xy
(x + 9y / x^2 - 9y^2 - 3y / x^2 + 3xy) . x - 3xy / x + 3y
chứng minh ràng nếu (x^2-15yz)/(a)=(9y^2-15xz)/(3b)=(15z^2-3xy)/(5c) thì (a^2-15bc)/(x)=(9b^2-15ac)/(3y)=(15c^2-3ab)/(5z)
1.Khai triển các hằng đẳng thức sau ^^
a) (2x^3-y^2)^3
b) (x-3y)(x^2+3xy+9y^2)
c) ( x+2y+z) (x+2y-z)
d) (2x^3y -0,5x^2)^3
e) (x^2-3).(x^4+3x^2+9)
f) (2x-1)(4x^2+2x+1)
1.Khai triển các hằng đẳng thức sau ^^
a) (2x^3-y^2)^3
b) (x-3y)(x^2+3xy+9y^2)
c) ( x+2y+z) (x+2y-z)
d) (2x^3y -0,5x^2)^3
e) (x^2-3).(x^4+3x^2+9)
f) (2x-1)(4x^2+2x+1)
a) \(\left(2x^3-y^2\right)^3\)
\(=\left(2x^3\right)^3-3\cdot\left(2x^3\right)^2\cdot y^2+3\cdot2x^3\cdot\left(y^2\right)^{^2}-\left(y^2\right)^3\)
\(=8x^9-3\cdot4x^6y^2+3\cdot2x^3y^4-y^6\)
\(=8x^9-12x^6y^2+6x^3y^4-y^6\)
b) \(\left(x-3y\right)\left(x^2+3xy+9y^2\right)\)
\(=x^3-\left(3y\right)^3\)
\(=x^3-27y^3\)
c) \(\left(x+2y+z\right)\left(x+2y-z\right)\)
\(=\left(x+2y\right)^2-z^2\)
\(=x^2+4xy+4y^2-z^2\)
d) \(\left(2x^3y-0,5x^2\right)^3\)
\(=\left(2x^3y-\dfrac{1}{2}x^2\right)^3\)
\(=8x^9y^3-6x^8y^2+\dfrac{3}{2}x^7y-\dfrac{1}{8}x^6\)
e) \(\left(x^2-3\right)\left(x^4+3x^2+9\right)\)
\(=\left(x^2-3\right)\left(4x^2+9\right)\)
\(=4x^4+9x^2-12x^2-27\)
\(=4x^4-3x^2-27\)
f) \(\left(2x-1\right)\left(4x^2+2x+1\right)\)
\(=\left(2x\right)^3-1^3\)
\(=8x^3-1\)
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\(a,\left(2x^3-y^2\right)^3=8x^9-12x^6y^2+6x^3y^4-y^6\)\(b,\left(x-3y\right)\left(x^2+3xy+9y^2\right)=x^3-27y^3\)
\(c,\left(x+2y+z\right)\left(x+2y-z\right)=\left(x+2y\right)^2-z^2=x^2+4xy+4y^2-z^2\)\(d,\left(2x^3y-0,5x^2\right)^3=8x^9y^3-6x^4y^2x^2+3x^3yx^4-0,125x^6=8x^9y^3-6x^6y^2+3x^7y-0,125x^6\)
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