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脱式计算:(能简算的要写出主要简算步骤) 2.87+5...

1、原式 =2.87×4 =11.48 2、原式 =36.5x(999+1) =36.5×1000 =36500 3、原式 =0.6x3.6÷0.9 =0.6×4 =2.4

5.89-3.14+2.87 =2.75+2.87 =5.62

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