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a) \(547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
b) \(158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
c) \(24.3.5.10\)
\(=\left(24.5\right).\left(10.3\right)\)
\(=120.30\)
\(=3600\)
d) \(12.5.15.7\)
\(=\left(12.5\right).\left(15.7\right)\)
\(=60.105\)
\(=6300\)
e) \(1122.34+2244.83\)
\(=1122.2.17+2244.83\)
\(=2244.17+2244.83\)
\(=2244.\left(17+83\right)\)
\(=2244.100\)
\(=224400\)
f) \(8466.15+170.4233\)
\(=8466.15+85.2.4233\)
\(=8466.15+85.8466\)
\(=8466.\left(15+85\right)\)
\(=8466.100\)
\(=846600\)
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a) 2 9 + − 5 12 − − 3 4 = 8 36 + − 15 36 − − 27 36 = 5 9
b) − 27 36 − 20 80 − 11 22 = 3 4 − 1 4 − 1 2 = − 3 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 9 + − 5 12 − − 3 4 = 8 36 + − 15 36 − − 27 36 = 5 9
b) − 27 36 − 20 80 − 11 22 = 3 4 − 1 4 − 1 2 = − 3 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1122.34+2244.83\)
\(=1122.34+1122.2.83\)
\(=1122.\left(34+2\right).83\)
\(=1122.36.83\)
\(=40392.83=3352536\)
![](https://rs.olm.vn/images/avt/0.png?1311)
341 x 67 + 341 x 16 + 659 x 83
= ( 67 +16 ) x 341 + 659 x 83
= 83 x 341 + 659 x 83
= 83 x ( 341 + 659 )
= 83 x 1000
= 83000
Đúng
341 . 67 + 341 . 16 + 659 . 83
= 341 . ( 67 + 16 ) + 659 . 83
= 341 . 83 + 659 . 83
= ( 341 + 659 ) x 83
= 1000 x 83
= 83000
1122 x 34 + 2244 x 83
= 1122 x 2 x 17 + 2244 x 83.
= 2244 x 17 + 2244 x 83
=2244 x ( 17 + 83 )
= 2244 x 100
= 224400
kết quả là 224400