m^2+m+()+()-1=3m^2-2m-1帮帮忙o(>﹏

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m^2+m+()+()-1=3m^2-2m-1帮帮忙o(>﹏

m^2+m+()+()-1=3m^2-2m-1帮帮忙o(>﹏
m^2+m+()+()-1=3m^2-2m-1
帮帮忙o(>﹏<)o……

m^2+m+()+()-1=3m^2-2m-1帮帮忙o(>﹏
()+()=(3m²-2m-1)-(m²+m-1)
=(3m²-m²)+(﹣2m-m)
=(2m²)+(﹣3m)