脱式计算能简算的要简算1.28+9.8+7.72+10.212×1120+12×204978×[67-(121+37)(80-9.8)×0.6-2.1.-数学
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答案
(1)1.28+9.8+7.72+10.2, =(1.28+7.72)+(9.8+10.2), =9+20, =29; (2)
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题文
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答案
(1)1.28+9.8+7.72+10.2, =(1.28+7.72)+(9.8+10.2), =9+20, =29; (2)
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