(1+0.56+0.67)×(0.56+0.67+78)-(1+0.56+0.67+78)×(0.56+0.67)计算 简便

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(1+0.56+0.67)×(0.56+0.67+78)-(1+0.56+0.67+78)×(0.56+0.67)计算 简便
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(1+0.56+0.67)×(0.56+0.67+78)-(1+0.56+0.67+78)×(0.56+0.67)计算 简便
(1+0.56+0.67)×(0.56+0.67+78)-(1+0.56+0.67+78)×(0.56+0.67)计算 简便

(1+0.56+0.67)×(0.56+0.67+78)-(1+0.56+0.67+78)×(0.56+0.67)计算 简便
(1+0.56+0.67)×(0.56+0.67+78)-(1+0.56+0.67+78)×(0.56+0.67)
=1*(0.56+0.67+78)+(0.56+0.67)*(0.56+0.67+78)-1*(0.56+0.67)-(0.56+0.67)*(0.56+0.67+78)
=0.56+0.67+78-0.56-0.67
=78