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2.5x56+4.5x65的简便算

=2.5×56+9×0.5×5×13 =2.5×56+117×2.5 =2.5×173 =2.5×172+2.5×1 =2.5×4×43+2.5 =10×43+2.5 =430+2.5 =432.5

5Ⅹ56十4.5x65 =280+292.5 =572.5

用简便方法计算124x56-24x56 124x56-24x56 =56*(124-24) =56*100 =5600

125x56 =125x8x7 =1000x7 =7000 99x65十165 =99x65十65+100 =(99+1)x65+100 =100x65+100 =6500+100 =6600 25十350x20一1364 =25+7000-1364 =7025-1364 =5661

原式 =56x(65-65) =56x0 =0 供参考。

56x65-65x56 =56×(65-65) =0

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