用简便方法计算 1.【(4*8)*25-8】*125 2.-100*1/8-0.123*35.5+14.5*(-12.5%)
问题描述:
用简便方法计算 1.【(4*8)*25-8】*125 2.-100*1/8-0.123*35.5+14.5*(-12.5%)
答
1.【(4*8)*25-8】*125 =(4x25x8-8)x125=800x125-8x125=100000-1000=990002.-100*1/8-0.125*35.5+14.5*(-12.5%)=-100x1/8-1/8x35.5-1/5x14.5=-1/8x(100+35.5+14.5)=-1/8x150=-150/8=-75/4