五年级下册数学口算练习题 1.(1+1/2)(1+1/3)(1+1/4).(1+1/100) 2.(1-1/2)(1-1/3)(1-1/4).(1-1/100) 3.8+2-8+2 4.25*4/25*4 5.7.26-(5.26-1.5) 6.286+198 7.314-202 8.526+301 9.223-99 10.6.25+3.85-2.125+3.875 11.9-2456*21 12.0.5/11.5-4*2.75 13.1/23/5 14.3.375+5.75+2.25+6.625 15.1001903618 16.3.85.25+14.5 17.2.1*4.3+5.7*2.1 18.301/3 19.102*45-328 20.2/312 21.2.8*3.1+17.6/8 22.3/55/6 23.(50-12.5)/2.5 24.2/51/3 25.6110*47+639 26.1/2-1/6 27.3.5*2.7-52.2/18
