下列各题怎样简便就怎样算.3.7×1.4×0.05 72×0.81+10.4 1.4×25+3.45 1.5×102 1.25×0.7×0.8
下列各题怎样简便就怎样算.3.7×1.4×0.0572×0.81+10.41.4×25+3.451.5×1021.25×0.7×0.82.7×3.7+0.37×738.7...
下列各题怎样简便就怎样算.3.7×1.4×0.05 72×0.81+10.4 1.4×25+3.45 1.5×102 1.25×0.7×0.8 2.7×3.7+0.37×73 8.7×99 0.8×(12.5-1.25) 1.25×0.4×80×2.5.
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3.7×1.4×0.05 =3.7×(1.4×0.05) =3.7×0.07 =0.259 | 72×0.81+10.4 =58.32+10.4 =68.72 | 1.4×25+3.45 =(1+0.4)×25+3.45 =25+0.4×25+3.45 =25+10+3.45 =35+3.45 =38.45 |
1.5×102 =1.5×(100+2) =1.5×100+1.5×2 =150+3 =153 | 1.25×0.7×0.8 =1.25×0.8×0.7 =1×0.7 =0.7 | 2.7×3.7+0.37×73 =2.7×3.7+3.7×7.3 =(2.7+7.3)×3.7 =10×3.7 =37 |
8.7×99 =8.7×(100-1) =8.7×100-8.7 =870-8.7 =861.3 | 0.8×(12.5-1.25) =0.8×12.5-0.8×1.25 =10-1 =9 | 1.25×0.4×80×2.5 =(1.25×80)×(0.4×2.5) =100×1 =100 |
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