1. 五年级上册数学作业本答案第30 31页
30页：用数学：1、一时=60分110/60=1.83..1.8340/60=0.6..0.672、830/340大约2.44点击奥数5/7=0.714285...是循环小数100位上是231页：1、56.3=2.78=59.08
8.72-5.863=2.857
2.574*3.56=9.163244
8.3/2.5=3.32
2、35.56/12.7=2.8
35.56/1.27=28
35.56/0.127=280
35.56/127=0.283、4/9=0.4...5/9=0.5...6/9=0.6...7/9=0.7...8/9=0.8...4、3*9=27
3.3*6.9=22.77
3.33*66.9=222.777
3.333*666.9=2222.7777
2. 小学五年级上册数学口算训练30页、31页的参考答案
7.8×10= 0.6×100= 3.71×10= 4.5×1000=
0.92×100= 6÷12＝ 0.87－0.49＝
5.2×10= 0.28×1000= 6.12×10= 0.479×100=
17.6×1000= 5÷100= 21.3÷10=
14.17÷100= 9.2÷10= 7.13÷10= 1÷100=
0.43÷10= 278.6÷1000= 53.4÷100=
38.2÷100= 2.33÷10= 4.56÷100= 9.02÷10=
70.77÷100= 356.8÷1000= 3.2×3=
1.4×0.5= 0.08×6= 1.5×0.3= 0.71×2=
0.25×4= 1.25×8= 4.3×2=
1.2×0.4= 0.6×0.9= 3.4×0.3=
5×0.6= 4.5×2= 0.03×0.5= 1.6×0.3=
0.23×3= 5.1×2= 9×0.3= 7.1×3=
1.5×6= 0.9×0.4×10= 0.68×8×1.25=
7.1×0.25×4= 16.4×2.9+16.4×7.1=
3.2×2.8+3.2×7.2= 1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)=
7.2÷3= 8.4÷4= 0.65÷5= 0.93÷3=
2.7÷9= 3.8÷2= 5.4÷0.8= 4.6÷2=
1.8÷0.3= 4.2÷7= 9.6÷0.6= 6.4÷3.2=
11÷0.11= 10÷2.5= 14÷0.2=
0.31÷3= 10.5÷5= 14.7÷0.7= 20÷0.5=
9.6÷1.2= 3.44÷2= 65÷0.3=
9.9÷11= 2.8÷2= 0.96÷3= 17×40＝
100－63＝ 3.2＋1.68＝ 2.8×0.4＝
14－7.4＝ 1.92÷0.04＝ 0.32×500＝ 0.65＋4.35＝
10－5.4＝ 4÷20＝ 3.5×200＝
1.5－0.06＝ 0.75÷15＝ 0.4×0.8＝ 4×0.25＝ 0.36＋1.54＝ 1.01×99＝ 420÷35＝
25×12＝ 135÷0.5＝ 3/4 + 1/4 = 2 + 4/9 =
3 - 2/3 = 3/4 - 1/2= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 = 0.51÷17＝
32.8＋19＝ 5.2÷1.3＝ 1.6×0.4＝
4.9×0.7＝ 1÷5＝