m^2+m+()+()-1=3m^2-2m-1帮帮忙o(>﹏扫码下载作业帮拍照答疑一拍即得
问题描述:
m^2+m+()+()-1=3m^2-2m-1
帮帮忙o(>﹏
扫码下载作业帮
拍照答疑一拍即得
答
()+()=(3m²-2m-1)-(m²+m-1)
=(3m²-m²)+(﹣2m-m)
=(2m²)+(﹣3m)