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0.8X(2.3%1.17)X1.25X(3.27+0.73)简便方法

=0.8x1.13x1.25x4 =(0.8x1.25)x(1.13x4) =1x4.52 =4.52

0.8*(2.3-1.17)*1.25*(3.27+0.73) =(2.3-1.17)*(3.27+0.73) =1.13*4 =4.52

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