如果x+y=5,xy=0,则x²y+xy²=?x²-xy+y²=?

来源：学生作业学帮网编辑：学帮网时间：2024/05/27 17:50:42

x+y=5,xy=0,则
x²y+xy²
=xy ( x+y)
= 0 x 5
= 0
x²-xy+y²
= x²+2xy+y² -3xy
=(x+y ) ² -3xy
= 5x5 - 0
= 25