3xy[2xy-3(xy-1/2x^2y)]
问题描述:
3xy[2xy-3(xy-1/2x^2y)]
答
3xy[2xy-3(xy-1/2x^2y)]
=3xy[2xy-3xy+3/2x^2y]
=3xy[-xy+3/2x^2y]
=-3x^2y^2+9/2x^3y^2哦亲,在详细一点吧...我看不懂啊