Question

Answer 1

1A
a) \(=3\left(x-y\right)+\left(x-y\right)\left(x+y\right)=\left(3+x+y\right)\left(x-y\right)\)
b) \(=\left(x^2+2xy+y^2\right)-4x^2y^2=\left(x+y\right)^2-\left(2xy\right)^2=\left(x+y-2xy\right)\left(x+y+2xy\right)\)
c)
\(=x^4\left(x^2-1\right)+2x^2\left(x-1\right)=x^4\left(x-1\right)\left(x+1\right)+2x^2\left(x-1\right)=\left(x^4\left(x+1\right)+2x^2\right)\left(x-1\right)\)
 

Answer 2

Bạn làm hộ mik câu 1B a và câu 2A d nha! Cảm ơn bạn