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1, -3x4y + 6x3y - 3x2y
= -3x2y (x2 - 2x + 1)
= -3x2y(x - 1)2
2, 12x2 - 12xy + 3y2
= 3(4x2 - 4xy + y2)
= 3(2x - y)2
3, 20x4y2 - 20x3y3 + 5x2y4
= 5x2y2(4x2 - 4xy + y2)
= 5x2y2(2x - y)2
4, 16x5y2 - 16x4y3 + 4x3y4
= 4x3y2(4x2 - 4xy + y2)
= 4x3y2(2x - y)2
5, -12x4y + 12x3y2 - 3x2y3
= -3x2y(4x2 - 4xy + y2)
= -3x2y(2x - y)2
6, (a2 + 4)2 - 16a2
= (a2 + 4 - 4a)(a2 + 4 - 4a)
7, (a2 + 9)2 - 36a2
= (a2 + 32)2 - (6a)2
= (a2 + 32 - 6a)(a2 + 32 + 6a)
= (a2 - 6a + 9)(a2 + 6a + 9)
8, (a2 + 4b2)2 - 16a2b2
= (a2 + 4b2 - 4ab)(a2 + 4b2 + 4ab)
= (a2 - 4ab + 4b2)(a2 + 4ab + 4b2)
= (a - 2b)2(a + 2b)2
= (a2 - 4b2)4
Câu này có sai thì bạn thông cảm nhá!!!
9, 36a2 - (a2 + 9)2
= (6a)2 - (a2 + 9)2
=- (a2 - 6a + 9)(a2 + 6a + 9)
= -(a - 3)2(a + 3)2
= -(a2 - 9)4
Câu 10 giống câu 8 bạn nhé
thầy cô, các anh chị, mọi ng giúp mk với. mk cần gấp
a) x4-4x3+4x2
= x2(x2-4x+4)
= x2(x-2)2
b) 2ab2-a2b-b3
= -b(-2ab+a2+b2)
=-b(a-b)2
e) x3+3x2-3x-1
= x3-x2+4x2-4x+x-1
=(x3-x2)+(4x2-4x)+(x-1)
=x2(x-1)+4x(x-1)+(x-1)
(x-1)(x2+4x+1)
f) x3-3x2-3x+1
=x3+x2-4x2-4x+x+1
=(x3+x2)-(4x2+4x)+(x+1)
=x2(x+1)-4x(x+1)+(x+1)
=(x+1)(x2-4x+1)
g)x3-4x2+4x-1
=x3-x2-3x2+3x+x-1
=(x3-x2)-(3x2-3x)+(x-1)
=x2(x-1)-3x(x-1)+(x-1)
=(x-1)(x2-3x+1)
Bài 1:
a)\(5x^2y^3-25x^3y^4+10x^3y^3=5x^2y^3\left(1-5xy+2x\right)\)
b)\(x^3-2xy-x^2y+2y^2=\left(x^3-x^2y\right)-\left(2xy-2y^2\right)=x^2\left(x-y\right)-2y\left(x-y\right)=\left(x-y\right)\left(x^2-2y\right)\)
c)Đề sai hoàn toàn
d) \(2x^2+4xy+2y^2-8z^2=2\left(x^2+2xy+y^2-4z^2\right)=2\left[\left(x+y\right)^2-\left(2z\right)^2\right]=2\left(x+y-2z\right)\left(x+y+2z\right)\)e) \(3x-3a+yx-ya=3\left(x-a\right)+y\left(x-a\right)=\left(x-a\right)\left(3+y\right)\)
f)\(\left(x^2+y^2\right)^2-4x^2y^2=\left(x-y\right)^2\left(x+y\right)^2\)
g)\(2x^2-5x+2=2x^2-x-4x+2=x\left(2x-1\right)-2\left(2x-1\right)=\left(2x-1\right)\left(x-2\right)\)
i)\(14x\left(x-y\right)-21y\left(y-x\right)+28z\left(x-y\right)=14x\left(x-y\right)+21y\left(x-y\right)+28z\left(x-y\right)=7\left(x-y\right)\left(2x+3y+4z\right)\)
\(A=2x^4+4x^3-7x^3-14x^2+8x^2+16x\)
\(=2x^2\left(x^2+2x\right)-7x\left(x^2+2x\right)+8\left(x^2+2x\right)\)
\(=\left(2x^2-7x+8\right)\left(x^2+2x\right)\)
\(=x\left(x+2\right)\left(2x^2-7x+8\right)\)
\(B=2x\left(x^2-4x+4-y^2\right)\)
\(=2x\left(\left(x-2\right)^2-y^2\right)\)
\(=2x\left(x-y-2\right)\left(x+y-2\right)\)
\(C=x\left(8y^2+8xy+2x^2-z^2\right)\)
\(=x\left(2\left(4y^2+4xy+x^2\right)-z^2\right)\)
\(=x\left(2\left(x+2y\right)^2-z^2\right)\)
\(=x\left(\sqrt{2}x+2\sqrt{2}y-z\right)\left(\sqrt{2}x+2\sqrt{2}y+z\right)\)
\(D=4a^4+10a^3+6a^2-6a^2-15a-9\)
\(=2a^2\left(2a^2+5a+3\right)-3\left(2a^2+5a+3\right)\)
\(=\left(2a^2-3\right)\left(2a^2+5a+3\right)\)
\(E=4a^3-ab^2+2ab-4a^2\)
\(=a\left(4a^2-b^2\right)-2a\left(2a-b\right)\)
\(=a\left(2a+b\right)\left(2a-b\right)-2a\left(2a-b\right)\)
\(=\left(2a-b\right)\left(2a^2+ab-2a\right)\)
\(F=5a^2-10a-4a+8\)
\(=5a\left(a-2\right)-4\left(a-2\right)\)
\(=\left(5a-4\right)\left(a-2\right)\)
\(G=a\left(2x+3y\right)-\left(2x+3y\right)\)
\(=\left(a-1\right)\left(2x+3y\right)\)
1.\(4a^2b^2-\left(a^2+b^2-1\right)^2\)
\(=\left(2ab\right)^2-\left(a^2+b^2-1\right)^2\)
\(=\left(2ab+a^2+b^2-1\right)\left(2ab-a^2-b^2+1\right)\)
\(=\left[\left(a+b\right)^2-1\right]\left[1-\left(a-b\right)^2\right]\)
2.\(\left(xy+4\right)^2-\left(2x+2y\right)^2\)
\(=\left(xy+4-2x-2y\right)\left(xy+4+2x+2y\right)\)
\(=\left[x\left(y-2\right)-2\left(y-2\right)\right]\left[x\left(y+2\right)+2\left(y+2\right)\right]\)
\(=\left(x-2\right)\left(y-2\right)\left(x+2\right)\left(y+2\right)\)
342562782944525266272177437674677263632625654354=\(\infty\)