数学题解答 63.8-63.8×0.99怎么简便
问题描述：
数学题解答 63.8-63.8×0.99怎么简便
答
63.8*(1-0.99)=0.638
答
=63.8-63.8*(1-0.01)=63.8-63.8*1+63.8*0.01=63.8-63.8+0.638=0.638
答
原式=63.8×(1-0.99)
=63.8×0.01
=63.8÷100
=0.638