计算 (3/2xy+x的2次方-y的2次方)(-2xy)-(-xy)的2次方(3/2xy+x²-y²)(-2xy)-(-xy)² 求速度,求帮忙
问题描述:
计算 (3/2xy+x的2次方-y的2次方)(-2xy)-(-xy)的2次方
(3/2xy+x²-y²)(-2xy)-(-xy)² 求速度,求帮忙
答
(3/2xy+x²-y²)(-2xy)-(-xy)²
(-3x²y² -2x³y+2xy³)-x²y²
=-4x²y²-2x³y+2xy³