4.25÷2.5×9.9+0.17的简便计算法
问题描述:
4.25÷2.5×9.9+0.17的简便计算法
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