用简便方法计算.①25×1.25×32②(3.75+4.1+2
用简便方法计算.①25×1.25×32②(3.75+4.1+2.35)×9.8③[240-(0.125×76+12.5%×24)×8]÷14....
用简便方法计算.①25×1.25×32②(3.75+4.1+2.35)×9.8③[240-(0.125×76+12.5%×24)×8]÷14.
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①25×1.25×32 =25×1.25×8×2, =(25×4)×(1.25×8), =100×10, =1000; ②(3.75+4.1+2.35)×9.8 =(3.75+2.25+4.1)×9.8, =(6+4.1)×9.8, =(10+0.1)×9.8, =10×9.8+9.8×0.1, =98+0.98, =98.98; ③[240-(0.125×76+12.5%×24)×8]÷14 =[240-(0.125×76+0.125×24)×8]÷14, =[240-(76+24)×0.125×8]÷14, =[240-100×0.125×8]÷14, =[240-100]÷14, =140÷14, =10. |
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