1. 直接写出得数。(20☆)
9.1+8.27=
0.009÷9=
29.28-8.06=
3.89+5.1=
5.8×3=
0.64÷8=
2.2+42.1=
5.07×6=
11.1÷3=
2.38-1.2=
1.6÷8=
13.6÷4=
0.77+26.9=
6.06×5=
5.81+3.24=
1.92÷0.3=
7.16×6=
6.38×2=
6.93÷3=
0.9+12.85=
11.37-9.33=
2.1×0.5=
21.6÷8=
15.54-11.45=
30.30÷15=
9.64+1.71=
60.60÷15=
7.8÷6=
10.68÷3=
44.4÷6=
8.8÷11=
561-0.2=
12.1÷11=
14.4÷12=
3.16×4=
9.9÷3=
3.51×5=
6.54÷3=
3.1×0.2=
11.97÷3=
9.1+8.27=
0.009÷9=
29.28-8.06=
3.89+5.1=
5.8×3=
0.64÷8=
2.2+42.1=
5.07×6=
11.1÷3=
2.38-1.2=
1.6÷8=
13.6÷4=
0.77+26.9=
6.06×5=
5.81+3.24=
1.92÷0.3=
7.16×6=
6.38×2=
6.93÷3=
0.9+12.85=
11.37-9.33=
2.1×0.5=
21.6÷8=
15.54-11.45=
30.30÷15=
9.64+1.71=
60.60÷15=
7.8÷6=
10.68÷3=
44.4÷6=
8.8÷11=
561-0.2=
12.1÷11=
14.4÷12=
3.16×4=
9.9÷3=
3.51×5=
6.54÷3=
3.1×0.2=
11.97÷3=
答案
1. 17.37 0.001 21.22 8.99
17.4 0.08 44.3 30.42
3.7 1.18 0.2 3.4
27.67 30.3 9.05 6.4
42.96 12.76 2.31 13.75
2.04 1.05 2.7 4.09
2.02 11.35 4.04 1.3
3.56 7.4 0.8 560.8
1.1 1.2 12.64 3.3
17.55 2.18 0.62 3.99
17.4 0.08 44.3 30.42
3.7 1.18 0.2 3.4
27.67 30.3 9.05 6.4
42.96 12.76 2.31 13.75
2.04 1.05 2.7 4.09
2.02 11.35 4.04 1.3
3.56 7.4 0.8 560.8
1.1 1.2 12.64 3.3
17.55 2.18 0.62 3.99
2. 写出下面各循环小数的近似数,保留三位小数。(12☆)
0.367070…≈
0.888…≈
$0.1\dot{6}\dot{3}≈$
$0.09\dot{5}\dot{2}≈$
$0.0\dot{2}\dot{8}≈$
$0.6\dot{0}\dot{2}≈$
0.367070…≈
0.367
0.888…≈
0.889
$0.1\dot{6}\dot{3}≈$
0.164
$0.09\dot{5}\dot{2}≈$
0.095
$0.0\dot{2}\dot{8}≈$
0.028
$0.6\dot{0}\dot{2}≈$
0.603
答案
2. 0.367 0.889
0.164 0.095
0.028 0.603
0.164 0.095
0.028 0.603
3. 请根据前三个算式得数,找出规律,直接写出后面算式的得数。(8☆)
(1)$10÷9=1.111···$ $11÷9=1.222···$ $12÷9=1.333···$
$13÷9=(\quad)$ $14÷9=(\quad)$ $15÷9=(\quad)$
$16÷9=(\quad)$ $17÷9=(\quad)$
(2)$12÷99=0.1212···$ $13÷99=0.1313···$ $35÷99=0.3535···$
$58÷99=(\quad)$ $70÷99=(\quad)$ $92÷99=(\quad)$
(1)$10÷9=1.111···$ $11÷9=1.222···$ $12÷9=1.333···$
$13÷9=(\quad)$ $14÷9=(\quad)$ $15÷9=(\quad)$
$16÷9=(\quad)$ $17÷9=(\quad)$
(2)$12÷99=0.1212···$ $13÷99=0.1313···$ $35÷99=0.3535···$
$58÷99=(\quad)$ $70÷99=(\quad)$ $92÷99=(\quad)$
答案
3. (1)1.444… 1.555… 1.666…
1.777… 1.888…
(2)0.5858… 0.7070… 0.9292…
1.777… 1.888…
(2)0.5858… 0.7070… 0.9292…
4. 比较下面这些小数的大小。(12☆)
$0.666 ○ 0.\dot{6}$
$6.\dot{4}\dot{8} ○ 6.4888$
$10.\dot{8}3\dot{6} ○ 10.8\dot{3}\dot{6}$
$0.1\dot{7} ○ 0.\dot{1}\dot{7}$
$3.2\dot{1}\dot{6} ○ 3.\dot{2}1\dot{6}$
$0.\dot{3}125\dot{9} ○ 0.3125\dot{5}\dot{9}$
用时:分钟 共得:☆/100 ☆
$0.666 ○ 0.\dot{6}$
$6.\dot{4}\dot{8} ○ 6.4888$
$10.\dot{8}3\dot{6} ○ 10.8\dot{3}\dot{6}$
$0.1\dot{7} ○ 0.\dot{1}\dot{7}$
$3.2\dot{1}\dot{6} ○ 3.\dot{2}1\dot{6}$
$0.\dot{3}125\dot{9} ○ 0.3125\dot{5}\dot{9}$
用时:分钟 共得:☆/100 ☆
答案
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