-5m(4m-3mn-n)计算
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-5m(4m-3mn-n)计算-5m(4m-3mn-n)计算-5m(4m-3mn-n)计算-5m(4m-3mn-n)=-20m^2+15m^2n+5mn-5m(4m-3mn-n)=-20m²
-5m(4m-3mn-n)计算
-5m(4m-3mn-n)计算
-5m(4m-3mn-n)计算
-5m(4m-3mn-n)
=-20m^2+15m^2n+5mn
-5m(4m-3mn-n)=-20m²+15m²n+5mn
-20m^2+15m^2n+5mn
-5m(4m-3mn-n)计算
若m-n=7,mn=5求(3m-5n+4mn)-(2m-4n+6mn)要计算过程]
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