化简 (1)3×(2a-b)= (2)-(a-b+c)=
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化简 (1)3×(2a-b)= (2)-(a-b+c)=
化简 (1)3×(2a-b)= (2)-(a-b+c)=
化简 (1)3×(2a-b)= (2)-(a-b+c)=