67.2×9.8+33点四四可以用简便方法计算
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亲亲,这道题解题过程如下,67.2×9.8+33.44=67.2×(1-0.2)+33.44=67.2-67.2×0.2+33.44=67.2-13.44+33.44=67.2-(13.44-33.44)=67.2-(-20=67.2+20=87.2)
咨询记录 · 回答于2023-01-12
67.2×9.8+33点四四可以用简便方法计算
亲亲,这道题解题过程如下,67.2×9.8+33.44=67.2×(1-0.2)+33.44=67.2-67.2×0.2+33.44=67.2-13.44+33.44=67.2-(13.44-33.44)=67.2-(-20=67.2+20=87.2)
亲亲,更正一下这道题解题过程如下,67.2×9.8+33.44=67.2×(10-0.2)+33.44=672-67.2×0.2+33.44=67.2-13.44+33.44=672-(13.44-33.44)=672-(-20)=672+20=692
计算时将9.8=10-0.2