一、口算。
83 - 50 =
72 - 8 =
93 - 4 - 40 =
35 + 40 =
26 + 60 =
71 - 50 + 20 =
16 - 7 =
82 - 6 =
92 - 8 + 7 =
3 + 59 =
4 + 8 =
32 + 60 - 4 =
47 - 30 =
42 - 4 =
72 - 9 - 5 =
54 + 6 =
50 + 49 =
9 + 21 + 15 =
70 - 70 =
63 - 5 =
69 - 60 + 79 =
59 + 6 =
40 + 50 =
36 + 9 - 20 =
24 - 10 =
42 - 6 =
35 - 8 + 20 =
23 + 40 =
14 + 8 =
18 + 9 + 30 =
83 - 50 =
72 - 8 =
93 - 4 - 40 =
35 + 40 =
26 + 60 =
71 - 50 + 20 =
16 - 7 =
82 - 6 =
92 - 8 + 7 =
3 + 59 =
4 + 8 =
32 + 60 - 4 =
47 - 30 =
42 - 4 =
72 - 9 - 5 =
54 + 6 =
50 + 49 =
9 + 21 + 15 =
70 - 70 =
63 - 5 =
69 - 60 + 79 =
59 + 6 =
40 + 50 =
36 + 9 - 20 =
24 - 10 =
42 - 6 =
35 - 8 + 20 =
23 + 40 =
14 + 8 =
18 + 9 + 30 =
答案
一、33 64 49
75 86 41
9 76 91
62 12 88
17 38 58
60 99 45
0 58 88
65 90 25
14 36 47
63 22 57
75 86 41
9 76 91
62 12 88
17 38 58
60 99 45
0 58 88
65 90 25
14 36 47
63 22 57
二、在(
73 -(
57 -(
40 +(
78 -(
(
46 -(
(
80 -(
42 +(
30
)里填合适的数。73 -(
20
)= 4357 -(
20
)= 3740 +(
45
)= 8578 -(
9
)= 69(
49
)+ 5 = 5446 -(
20
)= 26(
60
)- 5 = 5580 -(
8
)= 7242 +(
6
)= 48答案
二、30 20 45
9 49 20
60 8 6
9 49 20
60 8 6
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