2.51+3.53+0.49-15.4-1.47用简便方法计算

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2.51+3.53+0.49-15.4-1.47用简便方法计算2.51+3.53+0.49-15.4-1.47用简便方法计算2.51+3.53+0.49-15.4-1.47用简便方法计算2.51+3.

2.51+3.53+0.49-15.4-1.47用简便方法计算
2.51+3.53+0.49-15.4-1.47用简便方法计算

2.51+3.53+0.49-15.4-1.47用简便方法计算
2.51+3.53+0.49-15.4-1.47
=(2.51+0.49)+3.53-1.47-15.4
=3+3.53-16.87
=10.34