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5000 + 100 = 5100
7400 - 400 = 7000
2000 3 + 600 = 6600
8000 : 2 + 2000 = 6000
6000 - (5000 - 1000) = 2000
6000 - 5000 + 1000 = 2000
7000 - 3000 x 2 = 1000
(7000 - 3000) x 2 = 8000
5000 + 100 = 5100
7400 - 400 = 7000
2000 3 + 600 = 6600
8000 : 2 + 2000 = 6000
6000 - (5000 - 1000) = 2000
6000 - 5000 + 1000 = 2000
7000 - 3000 x 2 = 1000
(7000 - 3000) x 2 = 8000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3000 + 5000 = 8000
5000 + 5000 = 10 000
4000 + 4000 = 8000
7000 + 2000 = 9000
6000 + 1000 = 7000
2000 + 8000 = 10 000
b) 2000 + 700 = 2700
100 + 1000 = 1100
6000 + 600 = 6600
8000 + 500 = 8500
5000 + 300 = 5300
400 + 6000 = 6400
a) 3000+5000=8000
5000+5000=10000
4000+4000=8000
7000+2000=9000
6000+1000=7000
2000+8000=10000
b) 2000+700=2700
100+1000=1100
6000+600=6600
8000+500=8500
5000+300=5300
400+6000=6400
![](https://rs.olm.vn/images/avt/0.png?1311)
1000 + 2000 + 3000 + 4000 + 5000 + 6000
= ( 1000 + 6000 ) + ( 2000 + 5000 ) + ( 3000 + 4000 )
= 7000 + 7000 + 7000
= 21000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 9000 - 7000 = 2000
3000 - 2000 = 1000
8000 -8000 = 0
5000 - 1000 = 4000
6000 - 5000 = 1000
10000 - 2000 = 8000
b) 4600 - 400 = 4200
8500 - 500 = 8000
9900 - 300 = 9600
6800 - 700 = 6100
7200 - 3000 = 4200
5600 - 2000 = 3600
3800 - 3000 = 800
7400 - 400 = 7000
a)9000-7000=2000
3000-2000=1000
8000-8000=0
5000-1000=4000
6000-5000=1000
10000-2000=8000
b)4600-400=4200
8500-500=8000
9900-300=9600
6800-700=6100
7200-3000=4200
5600-2000=3600
3800-3000=800
7400-400=7000
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5000+5000+4000+6000+3000+7000\)
\(=\left(5000+5000\right)+\left(4000+6000\right)+\left(3000+7000\right)\)
\(=10000+10000+10000\)
\(=10000\times3\)
\(=30000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính nhẩm:
6000 + 3000 – 5000
= 9000 - 5000
= 4000
8000 – 3000 – 2000
= 5000 - 2000
= 3000
7000 – (1500 + 4500)
= 7000 - 6000
= 1000
6000 + 2000 – 3000
= 8000 - 3000
= 5000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3500 + 200 = 3700
3700 - 200 = 3500
7100 + 800 = 7900
7900 - 8000 = 7100
4400 + 300 = 4700
4700 - 3000 = 4400
b) 6000 + 2000 = 8000
8000 - 6000 = 2000
8000 - 2000 = 6000
7000 + 3000 = 10 000
10 000 - 7000 = 3000
10 000 - 3000 = 7000
2000 + 8000 = 10 000
10 000 - 2000 = 8000
10 000 - 8000 = 2000
![](https://rs.olm.vn/images/avt/0.png?1311)
5000 + 4500 = 9500
6000 + 7000 = 13000
2000 + 3000 = 5000
5000+4500=9500
6000+7000=13000
2000+3000=5000