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83.7×0.2+8.37×7+8.37怎么简便计算

83.7×0.2+8.37×7+8.37 =8.37*2+8.37*7+8.37 =8.37*(2+7+1) =83.7

2.8乄+3.7乄=83.2 6.5x=83.2 x=12.8

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