Question

Cho A=x²y,B=xy²,C=xy biet x+y=-1 chung minh rang A+B+C=0

Answer 1

Ta có:

\(A+B+C=x^2y+xy^2+xy\)

\(=xy.\left(x+y+1\right)\)

mà theo bài ra \(x+y=-1\) nên

\(A+B+C=xy.\left(-1+1\right)=xy.0=0\)

Vậy \(A+B+C=0\) (đpcm)

Chúc bạn học tốt!!!

Answer 2

Ta có: \(A+B+C=x^2y+xy^2+xy\)

\(=xy\left(x+y+1\right)=xy\left(-1+1\right)=0\)

\(\Rightarrowđpcm\)