一、口算。
20÷5=
4×7=
6×5+23=
7×4=
16÷2=
63-30+9=
57-40=
33+20=
31+9-20=
36-7=
45+8=
81÷9×6=
9×9=
8÷4=
9×3-8=
16-9=
9×7=
42-2×4=
45÷9=
6×8=
18÷9×7=
8×7=
9×8=
24-4×6=
4×8=
6÷3=
36÷9÷2=
18÷2=
25÷5=
63÷7×6=
20÷5=
4×7=
6×5+23=
7×4=
16÷2=
63-30+9=
57-40=
33+20=
31+9-20=
36-7=
45+8=
81÷9×6=
9×9=
8÷4=
9×3-8=
16-9=
9×7=
42-2×4=
45÷9=
6×8=
18÷9×7=
8×7=
9×8=
24-4×6=
4×8=
6÷3=
36÷9÷2=
18÷2=
25÷5=
63÷7×6=
答案
1.4
2.28
3.53
4.28
5.8
6.42
7.17
8.53
9.20
10.29
11.53
12.54
13.81
14.2
15.19
16.7
17.63
18.34
19.5
20.48
21.14
22.56
23.72
24.0
25.32
26.2
27.2
28.9
29.5
30.54
2.28
3.53
4.28
5.8
6.42
7.17
8.53
9.20
10.29
11.53
12.54
13.81
14.2
15.19
16.7
17.63
18.34
19.5
20.48
21.14
22.56
23.72
24.0
25.32
26.2
27.2
28.9
29.5
30.54
二、在()里填合适的数。
(
(
36÷(
(
(
(
51
)−9=42 8×(5
)=40 (40
)÷5−3=5(
21
)+9=30 45÷(9
)=5 (5
)×6−8=2236÷(
4
)=9 (28
)÷4=7 (8
)×3−4=20(
3
)×7=21 (6
)×9=54 (8
)×8+9=73(
6
)×8=48 (9
)×4=36 (32
)÷4+25=33答案
1.51
2.5
3.40
4.21
5.9
6.5
7.4
8.28
9.8
10.3
11.6
12.8
13.6
14.9
15.32
2.5
3.40
4.21
5.9
6.5
7.4
8.28
9.8
10.3
11.6
12.8
13.6
14.9
15.32
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