(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
问题描述：
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
答
原式=4x-2y-z-{5x-[8y-2z-x+2y]-x-3y+10z
=3x-5y+9z-{5x-10y+x+2z}
=3x-5y+9z-6x+10y-2z
=-3x+5y+7z已经没事了=。=但还是给你一个满意吧谢谢你！