4.25÷2.5×9.9+1.7 简便运算
解：原式=1.7+1.7
=3.4
4.25÷2.5×9.9+0.17
=(4.25×4)÷(2.5×4)×9.9+0.17
=17÷10×9.9+0.17
=1.7×9.9+0.17
=1.7×(10-0.1)+0.17
=17-0.17+0.17
=17
原式=[(4+0.25)÷2.5]×9.9+1.7
=(1.6+0.1)×9.9+1.7
=1.7×(10-0.1)+1.7
=17-0.17+1.7
=18.53
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