计算:
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+(9.89+1.1)×0.7
=9.89+10.99×0.7
=9.89+(10+1-0.01)×0.7
=9.89+10×0.7+0.7-0.01×0.7
=9.89+7+0.7-0.007
=17.59-0.007
=17.583
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
计算结果:1.7.0.6.