2.47乘0.69+76.3乘0.069,怎么简算?
问题描述:
2.47乘0.69+76.3乘0.069,怎么简算?
答
=0.69x(2.47+76.3x0.1)
=0.69x(2.47+7.63)
=0.69x10
=6.9