Câu hỏi của Shin

Question

Giúp mình với ạ :< mình đang cần gấp lắm

a. $15x^3y^2+10x^2y^2-2x^3y^3$

b. $-4x^3y-6x^2y^2-8x^4y^3$

c. $3a\left(a+b\right)+2\left(a+b\right)^2$

d, $16x^2-9\left(x+y\right)^2$

e, \(-a^2-2a...

Trần Thanh Phương · Accepted Answer

a) $15x^3y^2+10x^2y^2-2x^3y^3$

$=x^2y^2\left(15x+10-xy\right)$

b) $-4x^3y-6x^2y^2-8x^4y^3$

$=-2x^2y\left(2x+3y+4x^2y^2\right)$

c) $3a\left(a+b\right)+2\left(a+b\right)^2$

$=\left(a+b\right)\left(3a+2a+2b\right)$

$=\left(a+b\right)\left(5a+2b\right)$

d) $16x^2-9\left(x+y\right)^2$

$=\left(4x-3x-3y\right)\left(4x+3x+3y\right)$

$=\left(x-3y\right)\left(7x+3y\right)$

e) $-a^2-2a-41$

Sai đề

f) $5\left(x-1\right)^3-10\left(1-x\right)^2$

$=5\left(x-1\right)^3+10\left(x-1\right)^3$

$=15\left(x-1\right)^3$Câu trả lời: a) $15x^3y^2+10x^2y^2-2x^3y^3$