9-8.6*0.5-0.68简便算法
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9-8.6*0.5-0.68简便算法9-8.6*0.5-0.68简便算法9-8.6*0.5-0.68简便算法9-8.6*0.5-0.68=9-4.3-0.68=9-4.98=9-(5-0.02)=4+
9-8.6*0.5-0.68简便算法
9-8.6*0.5-0.68简便算法
9-8.6*0.5-0.68简便算法
9-8.6*0.5-0.68
=9-4.3-0.68
=9-4.98
=9-(5-0.02)
=4+0.02
=4.02