(x+y)(x눀-xy+y눀)=()要过程~THANKS

2024-11-17 08:36:23
推荐回答(1个)
回答1:

原式=x(x²-xy+y²)+y(x²-xy+y²)
=x³-x²y+xy²+x²y-xy²+y³
=x³+y³