6.4*0.99用简便方法做 7.6*2.02用简便方法做

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6.4*0.99用简便方法做7.6*2.02用简便方法做6.4*0.99用简便方法做7.6*2.02用简便方法做6.4*0.99用简便方法做7.6*2.02用简便方法做6.4×0.99=6.4×(1-

6.4*0.99用简便方法做 7.6*2.02用简便方法做
6.4*0.99用简便方法做 7.6*2.02用简便方法做

6.4*0.99用简便方法做 7.6*2.02用简便方法做
6.4×0.99
=6.4×(1-0.01)
=6.4×1-6.4×0.01
=6.4-0.064
=6.336
7.6×2.02
=7.6×(2+0.02)
=7.6×2+7.6×0.02
=15.2+0.152
=15.352