2(x2-2xy)-3(xy-y2)
问题描述:
2(x2-2xy)-3(xy-y2)
答
=2x平方-4xy-3xy+3y平方
=2x平方-7xy+3y平方
2(x2-2xy)-3(xy-y2)
=2x平方-4xy-3xy+3y平方
=2x平方-7xy+3y平方