来自刘德辉的问题
简便计算16.4+3.5+83.6+166.5(19-5780)÷19+78045×7.7+3.3×0.8-80%
简便计算16.4+3.5+83.6+166.5(19-5780)÷19+78045×7.7+3.3×0.8-80%
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2020-04-30 18:37
简便计算16.4+3.5+83.6+166.5(19-5780)÷19+78045×7.7+3.3×0.8-80%
简便计算16.4+3.5+83.6+166.5(19-5780)÷19+78045×7.7+3.3×0.8-80%
(1)16.4+3.5+83.6+166.5,=(16.4+83.6)+(3.5+166.5),=100+170,=270;(2)(19-5780)÷19+780,=19×119-5780×119+780,=1−380+780=1+780−380,=1480,=1120;(3)45×7.7+3.3×0.8-80%,=0.8×(7.7+3...