0.86×9.8+0.172简便计算

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0.86×9.8+0.172简便计算0.86×9.8+0.172简便计算0.86×9.8+0.172简便计算0.86×9.8+0.172=0.86×9.8+0.86*0.2=0.86*(9.8+0.2

0.86×9.8+0.172简便计算
0.86×9.8+0.172简便计算

0.86×9.8+0.172简便计算
0.86×9.8+0.172
=0.86×9.8+0.86*0.2
=0.86*(9.8+0.2)
=0.86*10
=8.6