3x3-3x2-y2+5y+x2-5y+y2 0.0 求亲们帮帮忙
问题描述:
3x3-3x2-y2+5y+x2-5y+y2 0.0 求亲们帮帮忙
答
3x3-3x2-y2+5y+x2-5y+y2
=3x3+(x2-3x2)+(y2-y2)+(5y-5y)
=3x3-2x2