|2a-3b|-|3b-2a|+|b|+[-(-c)]=|2a+3|-|-3-2a|+1+2 =2a+3-3-2a+3 =3不知对不对,小依你再验算一下吧
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3
因为|2a-3b|-|3b-2a|=0,(两者互为相反数)原式=-b+c=3.