9.89×1.7+1.1×0.7,简便计算?
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9.89*1.7+1.1*0.7
=9.89*(1+0.7)+1.1*0.7
=9.89+9.89*0.7+1.1*0.7
=9.89+0.7*(9.89+1.1)
=9.89+0.7*10.99
=9.89+7.693
=17.583
=9.89*(1+0.7)+1.1*0.7
=9.89+9.89*0.7+1.1*0.7
=9.89+0.7*(9.89+1.1)
=9.89+0.7*10.99
=9.89+7.693
=17.583
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