a, a.(b+c)+3.b +3.c
b,a.(m-n)+m-n
c,4x+by+4x+6x
e,7.a2 -7a.x -9a+9x
f,ay-ax-2x+2y
giúp mk nha mk đang học phần phân tích đa thức thành nhân tử
phân tích đa thức thành nhân tủ chung
1, a(b+c)+3b+3c
2, a(m-n)+(m-n)
3, 7a2-7a.x-9a+9x
4,4x+by+4y+bx
5, ay-ax-2x+2y
1, \(a.\left(b+c\right)+3b+3c=a.\left(b+c\right)+3.\left(b+c\right)\)= \(\left(b+c\right).\left(3+a\right)\)
2, \(a.\left(m-n\right)+\left(m-n\right)=\left(m-n\right).\left(a+1\right)\)
3, \(7a^2-7ax-9a+9x=7a.\left(a-x\right)-9.\left(a-x\right)\)= \(\left(a-x\right).\left(7a-9\right)\)
4, \(4x+by+4y+bx=4.\left(x+y\right)+b.\left(x+y\right)\)= \(\left(x+y\right).\left(4+b\right)\)
5, \(ay-ax-2x+2y=a.\left(y-x\right)+2.\left(y-x\right)\)= \(\left(y-x\right).\left(a+2\right)\)
Chúc bạn học tốt. Có gì không hiểu thì chat hỏi mik nhé. ^^
1. a(b+c)+3b+3c=a(b+c)+3(b+c)=(b+c)(a+3)
2.a(m-n)+(m-n)=(m-n)(a+1)
3. 7a2 -7ax-9a+9x=7a(a-x)-9(a-x)=(a-x)(7w-9
4. 4x+by+4y+bx=(4x+4y)+(by+bx)
5. ay-ax-2x+2y=(ay+2y)-(ax+2x)=y(a+2)-x(a+2)=(a+2)(y-x)
Phân tích đa thức thành nhân tử:
a, 3x^2 +2x
b, 5x - 5y + ax - ay
c, 4x^2 - 25
d,x^2 +6x +5
e, x^2 - y^2 + 2y -1
f, x^3 - 3x + 2
\(a,3x^2+2x=x\left(3x+2\right)\)
\(b,5x-5y+ax-ay=5\left(x-y\right)+a\left(x-y\right)=\left(x-y\right)\left(5+a\right)\)
\(c,4x^2-25=\left(2x-5\right)\left(2x+5\right)\)
\(d,x^2+6x+5=x^2+x+5x+5=x\left(x+1\right)+5\left(x+1\right)=\left(x+1\right)\left(x+5\right)\)
\(e,x^2-y^2+2y-1=x^2-\left(y^2-2y+1\right)=x^2-\left(y-1\right)^2=\left(x-y+1\right)\left(x+y-1\right)\)
a ) 3x2 + 2x
= x. ( 3x + 2 )
b ) 5x - 5y + ax - ay
= ( 5x + ax ) - ( 5y + ay )
= x.( 5 + a ) - y ( 5 + a )
= ( 5 + a ) ( x - y )
c ) 4x2 - 25
= ( 2x + 5 ) ( 2x - 5 )
d ) x2 + 6x + 5
= x2 + x + 5x + 5
= x.( x + 1 ) + 5.( x + 1 )
= ( x + 1 ) ( x + 5 )
e ) x2 - y2 + 2y - 1
= x2 - ( y - 1 )2
= ( x - y + 1 ) ( x + y - 1 )
f ) x3 - 3x + 2
= x3 + 2x2 - 2x2 - 4x + x + 2
= x2 ( x + 2 ) - 2x ( x + 2 ) + ( x + 2 )
= ( x + 2 ) ( x2 - 2x + 1 )
= ( x + 2 ) ( x - 1 )2
\(a)\)\(3x^2+2x=x\left(3x-2\right)\)
\(b)\)\(5x-5y+ax-ay=5\left(x-y\right)+a\left(x-y\right)=\left(x-y\right)\left(a+5\right)\)
\(c)\)\(4x^2-25=\left(2x\right)^2-5^2=\left(2x-5\right)\left(2x+5\right)\)
\(d)\)\(x^2+6x+5=\left(x^2+x\right)+\left(5x+5\right)=x\left(x+1\right)+5\left(x+1\right)=\left(x+1\right)\left(x+5\right)\)
\(e)\)\(x^2-y^2+2y-1\)
\(=\)\(x^2-\left(y^2-2y+1\right)\)
\(=\)\(x^2-\left(y-1\right)^2\)
\(=\)\(\left(x-y+1\right)\left(x+y-1\right)\)
\(f)\)\(x^3-3x+2\)
\(=\)\(\left(x^3-x\right)-\left(2x-2\right)\)
\(=\)\(x\left(x^2-1\right)-2\left(x-1\right)\)
\(=\)\(x\left(x-1\right)\left(x+1\right)-2\left(x-1\right)\)
\(=\)\(\left(x-1\right)\left[x\left(x+1\right)-2\right]\)
\(=\)\(\left(x-1\right)\left(x^2+x-2\right)\)
Chúc bạn học tốt ~
Phân tích mỗi đa thức sau thành nhân tử
a)x^3-2x^2y+xy^2+xy
b)x^3+4x^2y+4xy^2-9x
c)x^3-y^3+x-y
d)4x^2-4xy+2x-y+y^2
e)9x^2-3x+2y-4y^2
f)3x^2-6xy+3y^2-5x+5y
a) Xem lại đề
b) x³ - 4x²y + 4xy² - 9x
= x(x² - 4xy + 4y² - 9)
= x[(x² - 4xy + 4y² - 3²]
= x[(x - 2y)² - 3²]
= x(x - 2y - 3)(x - 2y + 3)
c) x³ - y³ + x - y
= (x³ - y³) + (x - y)
= (x - y)(x² + xy + y²) + (x - y)
= (x - y)(x² + xy + y² + 1)
d) 4x² - 4xy + 2x - y + y²
= (4x² - 4xy + y²) + (2x - y)
= (2x - y)² + (2x - y)
= (2x - y)(2x - y + 1)
e) 9x² - 3x + 2y - 4y²
= (9x² - 4y²) - (3x - 2y)
= (3x - 2y)(3x + 2y) - (3x - 2y)
= (3x - 2y)(3x + 2y - 1)
f) 3x² - 6xy + 3y² - 5x + 5y
= (3x² - 6xy + 3y²) - (5x - 5y)
= 3(x² - 2xy + y²) - 5(x - y)
= 3(x - y)² - 5(x - y)
= (x - y)[(3(x - y) - 5]
= (x - y)(3x - 3y - 5)
Bài 7: Phân tích đa thức sau thành nhân tử: a/ x – xy + y – y² b/ x²– 2x – y²+ 1 c)4x^2 -4xy +y^2 d)9x^3-9x^2y -4x +4y e)x^3 +2+3(x^3-2)
a) \(x-xy+y-y^2=x\left(1-y\right)+y\left(1-y\right)=\left(x+y\right)\left(1-y\right)\)
b) \(x^2-2x-y^2+1=\left(x^2-2x+1\right)-y^2=\left(x-1\right)^2-y^2=\left(x-y-1\right)\left(x+y-1\right)\)
c) \(4x^2-4xy+y^2=\left(2x\right)^2-2.2x.y+y^2=\left(2x-y\right)^2\)
d) \(9x^3-9x^2y-4x+4y=9x^2\left(x-y\right)-4\left(x-y\right)=\left(9x^2-4\right)\left(x-y\right)=\left(3x-2\right)\left(3x+2\right)\left(x-y\right)\)
e) \(x^3+2+3\left(x^3-2\right)=x^3+2+3x^3-6=4x^3-4=4\left(x^3-1\right)=4\left(x-1\right)\left(x^2+x+1\right)\)
phân tích đa thức thành nhân tử
a)(2a+3)*x-(2a+3)*y+(2a+3)
b)(4x-y)*(a-1)-(y-4x)*(b-1)+(4x-y)*(1-c)
c)x^k+1-x^k-1(k thuộc N,k>1)
d)x^m+3-x^m+1(m thuộc N)
e)3*(x-y)^3-2*(x-y)^2
f)81a^2+18a+1
g)25a^2*b^2-16c^2
h)(a-b)^2-2*(a-b)*c+c^2
i)(ax+by)^2-(ax-by)^2
\(a,\left(2a+3\right)x-\left(2a+3\right)y+\left(2a+3\right)\)
\(=\left(2a+3\right)\left(x-y+1\right)\)
\(b,\left(4x-y\right)\left(a-1\right)-\left(y-4x\right)\left(b-1\right)+\left(4x-y\right)\left(1-c\right)\)
\(=\left(4x-y\right)\left(a-1\right)+\left(4x-y\right)\left(b-1\right)+\left(4x-y\right)\left(1-c\right)\)
\(=\left(4x-y\right)\left(a-1+b-1+1-c\right)\)
\(=\left(4x-y\right)\left(a+b-c-1\right)\)
\(c,x^k+1-x^k-1\)
\(=0?!?!\)
\(d,x^m+3-x^m+1\)
\(=4\)
\(e,3\left(x-y\right)^3-2\left(x-y\right)^2\)
\(=\left(x-y\right)^2\left(3\left(x-y\right)-2\right)\)
\(=\left(x-y\right)^2\left(3x-3y-2\right)\)
\(f,81a^2+18a+1\)
\(=\left(9a\right)^2+2.9a+1\)
\(=\left(9a+1\right)^2\)
\(g,25a^2.b^2-16c^2\)
\(=\left(5ab\right)^2-\left(4c\right)^2\)
\(=\left(5ab+4c\right)\left(5ab-4c\right)\)
\(h,\left(a-b\right)^2-2\left(a-b\right)c+c^2\)
\(=\left(a-b-c\right)^2\)
\(i,\left(ax+by\right)^2-\left(ax-by\right)^2\)
\(=\left(ax+by-ax+by\right)\left(ax+by+ax-by\right)\)
\(=2by.2ax\)
\(=4axby\)
\(\text{a) }\left(2a+3\right)x-\left(2a+3\right)y+\left(2a+3\right)\)
\(=\left(2a+3\right)\left(x-y+1\right)\)
\(\text{b) }\left(4x-y\right)\left(a-1\right)-\left(y-4x\right)\left(b-1\right)+\left(4x-y\right)\left(1-c\right)\)
\(=\left(4x-y\right)\left(a-1\right)+\left(4x-y\right)\left(b-1\right)+\left(4x-y\right)\left(1-c\right)\)
\(=\left(4x-y\right)\left(a-1+b-1+1-c\right)\)
\(=\left(4x-y\right)\left(a+b-c-1\right)\)
\(\text{c) }x^k+1-x^k-1\)
\(=\left(x^k-x^k\right)+\left(1-1\right)\)
\(=0\)
\(\text{d) }x^m+3-x^m+1\)
\(=\left(x^m-x^m\right)+\left(3+1\right)\)
\(=4\)
\(\text{e) }3\left(x-y\right)^3-2\left(x-y\right)^2\)
\(=\left(x-y\right)^2\left[3\left(x-y\right)-2\right]\)
\(=\left(x-y\right)^2\left(3x-3y-2\right)\)
\(\text{f) }81a^2+18a+1\)
\(=\left(9a\right)^2+2.9a.1+1^2\)
\(=\left(9a+1\right)^2\)
\(\text{g) }25a^2b^2-16c^2\)
\(=\left(5ab\right)^2-\left(4c\right)^2\)
\(=\left(5ab+4c\right)\left(5ab-4c\right)\)
\(\text{h) }\left(a-b\right)^2-2.\left(a-b\right).c+c^2\)
\(=\left(a-b-c\right)^2\)
\(\text{i) }\left(ax+by\right)^2-\left(ax-by\right)^2\)
\(=\left(ax+by+ax-by\right)\left(ax+by-ax+by\right)\)
\(=2by.2ax\)
\(=4byax\)
Giúp mk nha
Bài 1 : Phân tích đa thức thành nhân tử
a) x2-6x-y2+9
b) 25-4x2-4xy -y2
c) x2+2xy+y2- xz-yz
d) x2-4xy+4y2-z2+4tz-4t2
Bài 2 : Phân tích đa thức thành nhân tử
a) ax2+cx2-ay+ay2-cy+cy2
b) ax^2+ay^2-bx^2-by^2+b-a
c) ac^2-ad-bc^2+cd+bd-c^3
Bài 3 : Tìm x
a) x(x-5)-4x+20=0
b) x(x+6)-7x-42=0
c) x^3-5x^2+x-5=0
d) x^4-2x^3+10x2-20x=0
Bài 1 :
a ) \(x^2-6x-y^2+9=\left(x^2-6x+9\right)-y^2=\left(x-3\right)^2-y^2=\left(x-3+y\right)\left(x-3-y\right)\)
b) \(25-4x^2-4xy-y^2=5^2-\left(4x^2+4xy+y^2\right)=5^2-\left(2x+y\right)^2=\left(5+2x+y\right)\left(5-2x-y\right)\)
c) \(x^2+2xy+y^2-xz-yz=\left(x+y\right)^2-z.\left(x+y\right)=\left(x+y\right)\left(x+y-z\right)\)
d) \(x^2-4xy+4y^2-z^2+4tz-4t^2=\left(x^2-4xy+4y^2\right)-\left(z^2-4tz+4t^2\right)\)
\(=\left(x-2y\right)^2-\left(z-2t\right)^2=\left(x-2y+z-2t\right).\left(x-2y-z+2t\right)\)
BÀi 2 :
a) \(ax^2+cx^2-ay+ay^2-cy+cy^2=\left(ax^2+cx^2\right)-\left(ay+cy\right)+\left(ay^2+cy^2\right)\)
\(=x^2.\left(a+c\right)-y\left(a+c\right)+y^2.\left(a+c\right)=\left(a+c\right).\left(x^2-y+y^2\right)\)
b) \(ax^2+ay^2-bx^2-by^2+b-a=\left(ax^2-bx^2\right)+\left(ay^2-by^2\right)-\left(a-b\right)\)
\(=x^2.\left(a-b\right)+y^2.\left(a-b\right)-\left(a-b\right)=\left(a-b\right)\left(x^2+y^2-1\right)\)
c) \(ac^2-ad-bc^2+cd+bd-c^3=\left(ac^2-ad\right)+\left(cd+bd\right)-\left(bc^2+c^3\right)\)
\(=-a.\left(d-c^2\right)+d.\left(b+c\right)-c^2.\left(b+c\right)=\left(b+c\right).\left(d-c^2\right)-a\left(d-c^2\right)\)
\(=\left(b+c-a\right)\left(d-c^2\right)\)
BÀi 3 :
a) \(x.\left(x-5\right)-4x+20=0\) \(\Leftrightarrow x\left(x-5\right)-4\left(x-5\right)=0\) \(\Leftrightarrow\left(x-5\right)\left(x-4\right)=0\)
\(\Leftrightarrow\hept{\begin{cases}x-5=0\\x-4=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=5\\x=4\end{cases}}}\)
b) \(x.\left(x+6\right)-7x-42=0\)\(\Leftrightarrow x.\left(x+6\right)-7.\left(x+6\right)=0\) \(\Leftrightarrow\left(x+6\right)\left(x-7\right)=0\)
\(\Leftrightarrow\hept{\begin{cases}x+6=0\\x-7=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=-6\\x=7\end{cases}}}\)
c) \(x^3-5x^2+x-5=0\) \(\Leftrightarrow x^2.\left(x-5\right)+\left(x-5\right)=0\) \(\Leftrightarrow\left(x-5\right)\left(x^2+1\right)\)
\(\Leftrightarrow\hept{\begin{cases}x^2+1=0\\x-5=0\end{cases}\Leftrightarrow\hept{\begin{cases}x^2=-1\left(KTM\right)\\x=5\end{cases}}}\)
d) \(x^4-2x^3+10x^2-20x=0\) \(\Leftrightarrow x.\left(x^3-2x^2+10x-20\right)=0\)\(\Leftrightarrow x.\left[x^2.\left(x-2\right)+10.\left(x-2\right)\right]=0\) \(\Leftrightarrow x.\left(x-2\right)\left(x^2+10=0\right)\)
\(\Leftrightarrow\hept{\begin{cases}x=0\\x-2=0\\x^2+10=0\end{cases}\Leftrightarrow\hept{\begin{cases}x=0\\x=2\\x^2=-10\left(KTM\right)\end{cases}}}\)
Bài 1:Rút gọn
a) -2x(-3X+2)-(x+2)^2
b)(x+2)(x^2-2x+4)-2(x+1)(1-x)
c)(2x-1)^2-2(4x^2-1)+(2x+1)^2
d)x^2-3x+xy-3y
Bài 2:Phân tích đa thức thành nhân tử
a)4x^ 2-4xy+y^2
b)9x^3-9x^2y-4x+4y
c)x^3+2+3(x^3-2)
Bài 3:Tìm x biết:2(x-2)=x^2-4x+4
giúp mk với,mk đang cần gấp!
Bài 1.
a) -2x( -3x + 2 ) - ( x + 2 )2
= 6x2 - 4x - ( x2 + 4x + 4 )
= 6x2 - 4x - x2 - 4x - 4
= 5x2 - 8x - 4
b) ( x + 2 )( x2 - 2x + 4 ) - 2( x + 1 )( 1 - x )
= x3 + 8 + 2( x + 1 )( x - 1 )
= x3 + 8 + 2( x2 - 1 )
= x3 + 8 + 2x2 - 2
= x3 + 2x2 + 6
c) ( 2x - 1 )2 - 2( 4x2 - 1 ) + ( 2x + 1 )2
= 4x2 - 4x + 1 - 8x2 + 2 + 4x2 + 4x + 1
= 4
d) x2 - 3x + xy - 3y
= x( x - 3 ) + y( x - 3 )
= ( x - 3 )( x + y )
Bài 2.
a) 4x2 - 4xy + y2 = ( 2x - y )2
b) 9x3 - 9x2y - 4x + 4y
= 9x2( x - y ) - 4( x - y )
= ( x - y )( 9x2 - 4 )
= ( x - y )( 3x - 2 )( 3x + 2 )
c) x3 + 2 + 3( x3 - 2 )
= x3 + 2 + 3x3 - 6
= 4x3 - 4
= 4( x3 - 1 )
= 4( x - 1 )( x2 + x + 1 )
Bài 3.
2( x - 2 ) = x2 - 4x + 4
⇔ ( x - 2 )2 - 2( x - 2 ) = 0
⇔ ( x - 2 )( x - 2 - 2 ) = 0
⇔ ( x - 2 )( x - 4 ) = 0
⇔ x = 2 hoặc x = 4
Giúp mình với :Phân tích đa thức sau thành nhân tử:
a,a^2+b^2-a^2.b^2+ab-a-b-1
b,b^4-9a^2-4b^2+4
c,3x^6-4x^5+2x^4-8x^3+2x^2-4x+3
d,x^4+3x^3-14x^2-6x+4
e,2y^4+12y^2-14
2/ (b4 - 4b2 + 4) - 9a2 = (b2 - 2)2 - 9a2 = (b2 - 2 + 3a)(b2 - 2 - 3a)
3/ (x2 +1)(x2 + x + 1)[x + (√13 - 7)/6][3x - (√13 + 7)/2]
bạn viết hẳn cách làm câu 3 cho mình đc k mình k hiểu lắm =)
Bài 1:Thực hiện phép tính a) x(3x^2 + 2x) b) (x + 3)^2 c) (x - 2)^3 Bài 2: Phân tính đa thức thành nhân tử a) 6x^3y - 9x^2y^2 b) 4x^2 - 25 c) x^2y - xy + 7x - 7y Bài 3: a) Tính nhanh giá trị biểu thức: M = 4x^2 - 20x + 25 tại x = 105/2 b) Tìm x, biết: x^3 - 1/9x = 0