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0.888x125x7+999x3的简算

0.888x125x7+999x3=0.111x(8x125)x7+(1000-1)x3=0.777x1000+1000x3-3=3774

0.888x125x73+999x3 =(0.8+0.08+0.008)x125x73+(1000-1)x3 =0.8x125x73+0.08x125x73+0.008x125x73+1000x3-1x3 =100x73+10x73+1x73+3000-3 =7300+730+73+3000-3 =8030+3070 =1110

=0.111×8×125×73+111×9×3 =0.111×(8×125)×73+111×(9×3) =111×73+111×27 =111×(73+27) =111×100 =11100

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