3xy(x²-1)-2x²(1/2xy+y/x)
问题描述:
3xy(x²-1)-2x²(1/2xy+y/x)
答
原式=3x³y-3xy-x³y-xy
=2x³y-4xy
3xy(x²-1)-2x²(1/2xy+y/x)
原式=3x³y-3xy-x³y-xy
=2x³y-4xy