用简便方法计算.301×79 25×32×125 125×88 8.59+2.57+3.43+5.47
用简便方法计算.301×7925×32×125125×888.59+2.57+3.43+5.4749.62+27.17-19.621546-(546-239)...
用简便方法计算.301×79 25×32×125 125×88 8.59+2.57+3.43+5.47 49.62+27.17-19.62 1546-(546-239)
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(1)301×79 =(300+1)×79, =300×79+1×79, =23700+79, =23779; (2)25×32×125 =25×4×8×125, =(25×4)×(8×125), =100×1000, =100000; (3)125×88 =125×8×11, =1000×11, =11000; (4)8.59+2.57+3.43+5.47 =8.59+(2.57+3.43)+5.47, =8.59+6+5.47, =20.06; (5)49.62+27.17-19.62 =49.62-19.62+27.17, =30+27.17, =57.17; (6)1546-(546-239) =1546-546+239, =1000+239, =1239. |
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