"5.89×0.5×4×0.5"用简便方法计算
问题描述：
"5.89×0.5×4×0.5"用简便方法计算
答
5.89×0.5×4×0.5
=5.89×(0.5×4×0.5)
=5.89x1
=5.890.99×470.99x47=(1-0.01)x47=1x47-0.01x47=47-0.47=46.53