x+2的绝对值+(3-y)的平方=0
所以
x+2=0,x=-2
3-y=0,y=3
(1)x²=2²=4
(2)题目不完整 ..x的y次方-xy分之xx的y次方-xy分之x=(-2)³-(-2)/(-2)x3=-8-1/3=-8又1/3