=3.6×31.4+31.4×0.1×84
=3.6×31.4+31.4×8.4
=(3.6+8.4)×31.4
=12×31.4
=376.8
3.6×31又2/5＋3.14×84（簡便運算
3.6×31又2/5＋3.14×84（簡便運算
數(shù)學人氣：848 ℃時間：2020-07-06 01:23:05
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