五六年级数学计算题100道及答案7/25×4/9+7/25×5/9=7/25×(4/9+5/9)=7/25×1=7/2560×(1/12+1/15+1/4)=60×1/12+60×1/15+60×1/4=5+4+15=24(5/12-3/8)×72=5/12×72-3/8×72=30-27=36/7-5/24÷7/12=6/7-5/24×12/7=12/14-5/14=7/14=1/2[3/4×(7/16-1/4)]÷9/13=3/4×(7/16-4/16)×13/9=1/4×3/16×13/3=13/642/3-7/8+1/3=(2/3+1/3)-7/8=1-7/8=1/85/6-(3/7-1/6)=(5/6+1/6)-3/7=1-3/7=4/71-1/3-2/3=1-(1/3+2/3)=1-1=01+3/5-1/10=1+6/10-1/10=1+1/2=1又1/23/8-12/13+5/8=3/8+5/8-12/13=1-12/13=1/131-(1/2-3/4)=1+3/4-2/4=1+1/4=5/41-1/2-1/4=1/2-1/4=2/4-1/4=1/42/7-8/9+5/7=(2/7+5/7)-8/9=1-8/9=1/92-1/4-3/4=2-(1/4+3/4)=2-1=11/2-(3/8-1/2)=1/2+1/2-3/4=1-3/8=5/82
64×1=2
15×(10
15×10=31
7×10=270
8)×8÷(0
125×8)=0
5×8÷1=418