4.25÷2.5×9.9+0.17的简便计算法

分类: 作业答案 • 2021-12-20 05:33:40

问题描述：

答

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

答

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