Question

Xin câu 30 ạ

Answer 1

Đáp án:B

`B=2x+2y+3xy(x+y)+5(x^3y^2+x^2y^3+4`

`=2(x+y)+3xy(x+y)+5x^2y^2(x+y)+4`

`=(x+y)(2+3xy+5x^2y^2)+4`

Vì `x+y=0`

`=>B=0+4=4`

Answer 2

30. B

2(x+y)+3xy(x+y)+5x²y²(x+y)+4

Answer 3

B

Answer 4

30-B