Question

Nếu x+y=0

A=x³+2x²y+2x+xy²+2y+12 

A=?

*giải thích nhé

Answer 1

A=x^3+2x^2y+2x+xy^2+2y+12

=x^3+x^2y+x^2y+2x+xy^2+2y+12

=(x^3+x^2y)+(x^2y+xy^2)+(2x+2y)+12

=x^2.(x+y)+xy(x+y)+2(x+y)+12

=0+0+0+12=12

 Vậy A=12

Answer 2

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