简便计算,能简便的简便 5/7÷(5-3×2/3) 84×0.25+1/4×16 48×(1/3-1/2+1/4)

简便计算,能简便的简便 5/7÷(5-3×2/3) 84×0.25+1/4×16 48×(1/3-1/2+1/4)
简便计算,能简便的简便 5/7÷(5-3×2/3) 84×0.25+1/4×16 48×(1/3-1/2+1/4)

简便计算,能简便的简便 5/7÷(5-3×2/3) 84×0.25+1/4×16 48×(1/3-1/2+1/4)
第一题,5/7÷(5-2)=5/7÷3=5/21