问题
填空题
计算：-5xy（x2-xy）+3xy-x2=______．
答案
-5xy（x2-xy）+3xy•x2
=-5x3y+5x2y2+3x3y
=5x2y2-2x3y．
故答案为：5x2y2-2x3y
搜题请搜索小程序“爱下问搜题”
计算：-5xy（x2-xy）+3xy-x2=______．
-5xy（x2-xy）+3xy•x2
=-5x3y+5x2y2+3x3y
=5x2y2-2x3y．
故答案为：5x2y2-2x3y