4.25/2.5*9.9+0.17怎么简便

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4.25/2.5*9.9+0.17怎么简便
4.25/2.5*9.9+0.17怎么简便

4.25/2.5*9.9+0.17怎么简便
=4.25*4*9.9/(2.5*4)+0.17
=17*9.9/10+0.17
=1.7*9.9+1.7*0.1
=1.7*(9.9+0.1)
=1.7*10
=17

=1.5*（10-0.1）+0.17
=15-0.15+0.17
=15+0.02
=15.02

4.25/2.5*9.9+0.17
=（4+0.25）*0.4*9.9+0.17
=（4*0.4+0.25*0.4）*9.9+0.17
=1.7*9.9+1.7*0.1
=1.7*（9.9+0.1）
=1.7*10
=17

4.25/2.5*9.9+0.17
=1.7X(10-0.1)+0.17
=17-0.17+0.17
=17

4.25/2.5*9.9+0.17
=425/25*99+17/100
=17/99+17/100
=17*(100+99)/9900
=17*199/9900
=3383/9900

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