简便算法 100×1∕8-0.25×35.5+14.5(-12.5%)

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简便算法100×1∕8-0.25×35.5+14.5(-12.5%)简便算法100×1∕8-0.25×35.5+14.5(-12.5%)简便算法100×1∕8-0.25×35.5+14.5(-12.5

简便算法 100×1∕8-0.25×35.5+14.5(-12.5%)
简便算法 100×1∕8-0.25×35.5+14.5(-12.5%)

简便算法 100×1∕8-0.25×35.5+14.5(-12.5%)
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

100×1∕8-0.25×35.5+14.5(-12.5%)
=100*0.125-14.5*0.125-0.25*35.5
=100*0.125-14.5*0.125-0.125*70
=(100-14.5-70)*0.125
=15.5*0.125
=1.9375