4.25÷2.5×9.9+0.17的简便计算法

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4.25÷2.5×9.9+0.17的简便计算法4.25÷2.5×9.9+0.17的简便计算法4.25÷2.5×9.9+0.17的简便计算法4.25÷2.5×9.9+0.17=1.7×9.9+0.17=

4.25÷2.5×9.9+0.17的简便计算法
4.25÷2.5×9.9+0.17的简便计算法

4.25÷2.5×9.9+0.17的简便计算法
4.25÷2.5×9.9+0.17
=1.7×9.9+0.17
=1.7×9.9+0.1×1.7
=1.7×(9.9+0.1)
=1.7×10
=17

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