简便算法 100×1∕8-0.25×35.5+14.5(-12.5%)

题目

简便算法 100×1∕8-0.25×35.5+14.5(-12.5%)

答案

100×1∕8-0.25×35.5+14.5(-12.5%)
= 100×1∕8-1/4×71/2+14.5×(-1/8)
= 100×1∕8-71×1/8-14.5×1/8
=1/8×(100-71-14.5)
=1/8×14.5
=1/8×29/2
=29/16