Question

Phan tich thanh nhan tu ( bang ki thuat bo sung hang dang thuc)

x^2+xy-2y^2

x^2-3xy-2y^2

x^2-xy-6y^2

2x^2 - 3xy -2y^2

Answer 1

a/ \(=2xy+x^2-2y^2-xy=x\left(2y+x\right)-y\left(2y+x\right)=\left(x-y\right)\left(2y+x\right)\)

b/ \(=x^2-3xy-2y^2\)

c/ \(=2xy-6y^2+x^2-3xy=2y\left(x-3y\right)+x\left(x-3y\right)=\left(2y+x\right)\left(x-3y\right)\)

d/ \(=xy-2y^2+2x^2-4xy=y\left(x-2y\right)+2x\left(x-2y\right)=\left(y+2x\right)\left(x-2y\right)\)

Answer 2

a)(x-y)(x+2y)

b) nghiệm lẻ>mìh nghĩ là sai đề

c)(x-3y)(x+2y)

d)(x-2y)(2x+y)
 

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li-ke cho mk nha bnLe Ngoc Bao Chau