1. 直接写出得数。
265 - 100 =
525 + 246 =
56 - 27×2 =
127×8×13×0 =
125×8 =
90÷5 =
4×5 + 5×3 =
7 + 2 - 7 + 2 =
265 - 100 =
165
525 + 246 =
771
56 - 27×2 =
2
127×8×13×0 =
0
125×8 =
1000
90÷5 =
18
4×5 + 5×3 =
35
7 + 2 - 7 + 2 =
4
答案:
265 - 100 = 165
525 + 246 = 771
56 - 27×2 = 56 - 54 = 2
127×8×13×0 = 0
125×8 = 1000
90÷5 = 18
4×5 + 5×3 = 20 + 15 = 35
7 + 2 - 7 + 2 = 4
525 + 246 = 771
56 - 27×2 = 56 - 54 = 2
127×8×13×0 = 0
125×8 = 1000
90÷5 = 18
4×5 + 5×3 = 20 + 15 = 35
7 + 2 - 7 + 2 = 4
2. 用竖式计算下面各题,并验算。
434 - 275 =
```
434
- 275
------
159
```
验算:
```
159
+ 275
------
434
```
298 + 145 =
```
298
+ 145
------
443
```
验算:
```
443
- 145
------
298
```
53×26 =
```
53
× 26
------
318
106
------
1378
```
验算:
```
26
× 53
------
78
130
------
1378
```
702÷54 =
```
13
54)702
54
------
162
162
------
0
```
验算:
```
54
× 13
------
162
54
------
702
```
434 - 275 =
159
```
434
- 275
------
159
```
验算:
```
159
+ 275
------
434
```
298 + 145 =
443
```
298
+ 145
------
443
```
验算:
```
443
- 145
------
298
```
53×26 =
1378
```
53
× 26
------
318
106
------
1378
```
验算:
```
26
× 53
------
78
130
------
1378
```
702÷54 =
13
```
13
54)702
54
------
162
162
------
0
```
验算:
```
54
× 13
------
162
54
------
702
```
答案:
434 - 275 = 159
```
434
- 275
------
159
```
验算:
```
159
+ 275
------
434
```
298 + 145 = 443
```
298
+ 145
------
443
```
验算:
```
443
- 145
------
298
```
53×26 = 1378
```
53
× 26
------
318
106
------
1378
```
验算:
```
26
× 53
------
78
130
------
1378
```
702÷54 = 13
```
13
54)702
54
------
162
162
------
0
```
验算:
```
54
× 13
------
162
54
------
702
```
```
434
- 275
------
159
```
验算:
```
159
+ 275
------
434
```
298 + 145 = 443
```
298
+ 145
------
443
```
验算:
```
443
- 145
------
298
```
53×26 = 1378
```
53
× 26
------
318
106
------
1378
```
验算:
```
26
× 53
------
78
130
------
1378
```
702÷54 = 13
```
13
54)702
54
------
162
162
------
0
```
验算:
```
54
× 13
------
162
54
------
702
```
3. 计算下面各题。
45 + 480÷20 - 5
45 + 480÷(20 - 5)
(45 + 480)÷(20 - 5)
45 + 480÷20 - 5
45 + 480÷(20 - 5)
(45 + 480)÷(20 - 5)
答案:
45 + 480÷20 - 5
=45 + 24 - 5
=69 - 5
=64
45 + 480÷(20 - 5)
=45 + 480÷15
=45 + 32
=77
(45 + 480)÷(20 - 5)
=525÷15
=35
=45 + 24 - 5
=69 - 5
=64
45 + 480÷(20 - 5)
=45 + 480÷15
=45 + 32
=77
(45 + 480)÷(20 - 5)
=525÷15
=35
4. 用简便方法计算。
125×7×8
420÷4÷5
25×(20 + 4)
376 - 43 - 57
18×253 - 18×53
365 + 59 + 35 + 21
125×7×8
420÷4÷5
25×(20 + 4)
376 - 43 - 57
18×253 - 18×53
365 + 59 + 35 + 21
答案:
125×7×8
=125×8×7
=1000×7
=7000
420÷4÷5
=420÷(4×5)
=420÷20
=21
25×(20 + 4)
=25×20 + 25×4
=500 + 100
=600
376 - 43 - 57
=376 - (43 + 57)
=376 - 100
=276
18×253 - 18×53
=18×(253 - 53)
=18×200
=3600
365 + 59 + 35 + 21
=(365 + 35) + (59 + 21)
=400 + 80
=480
=125×8×7
=1000×7
=7000
420÷4÷5
=420÷(4×5)
=420÷20
=21
25×(20 + 4)
=25×20 + 25×4
=500 + 100
=600
376 - 43 - 57
=376 - (43 + 57)
=376 - 100
=276
18×253 - 18×53
=18×(253 - 53)
=18×200
=3600
365 + 59 + 35 + 21
=(365 + 35) + (59 + 21)
=400 + 80
=480
查看更多完整答案,请扫码查看