x+y+1的绝对值+xy-3的绝对值等于0,求xy대加x대y的值

2025-04-06 04:19:08
推荐回答(1个)
回答1:

|x+y+1|+|xy-3|=0
则x+y+1=0,xy-3=0
则x+y=-1,xy=3
xy³+x³y=xy(y²+x²)=xy[(x+y)²-2xy]=3×[(-1)²-2×3]=-15