4.2÷2.5×99+1.7简便计算？
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依题意列式计算如下：
4.25÷2.5×9.9+1.7
=(4.25×4)÷(2.5×4)×99+1.7
=17÷10×99+1.7
=1.7×9.9+1.7
=1.7×(9.9+1)
=1.7×(10+0.9)
=1.7×10+1.7×0.9
=17+1.7×1-1.7×0.1
=17+1.7-0.17
=18.4-0.17
=18.53
4.25÷2.5×9.9+1.7
=(4.25×4)÷(2.5×4)×99+1.7
=17÷10×99+1.7
=1.7×9.9+1.7
=1.7×(9.9+1)
=1.7×(10+0.9)
=1.7×10+1.7×0.9
=17+1.7×1-1.7×0.1
=17+1.7-0.17
=18.4-0.17
=18.53
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