7.3＋12.8-3.8x2.3怎样简便计算

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7.3＋12.8-3.8×2.3
=7.3+12.8-(4-0.2)×2.3
=7.3+12.8-9.2+0.46
=20.1-9.2+0.46
=20.1+0.46-9.2
=20.56-9.2
=11.36

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