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15 . 37 . 4 + 120 . 21 + 21 . 5 . 12
= 15 . 4 . 37 + 21 ( 120 + 5 . 12 )
= 60 . 37 + 21 ( 120 + 60 )
= 2220 + 21 . 180
= 2220 + 3780
= 6000
5.3.37.4+5.24.21+21.5.12
= 5.(3.37.4+24.21+21.12)
= 5.1200
= 6000
![](https://rs.olm.vn/images/avt/0.png?1311)
5.3.37.4+5.24.21+21.5.12
= 5.(3.37.4+24.21+21.12)
= 5.1200
= 6000
![](https://rs.olm.vn/images/avt/0.png?1311)
= ( 37 - 15 ) .4 ( vì ở phép nào cũng có số 21 ) + 120 .21 + 21 . 5 . 12
= 21 . 4 + 120 . 21 + 21 . 5.12
= 21 . ( 4 + 120 + 12 )
= 21. 136
= 2 856
mk nghĩ thế
![](https://rs.olm.vn/images/avt/0.png?1311)
15.37.4 + 120.21 + 21.5.12 = 15.4.37 + 21.2.60 + 5.12.21 = 60.37 + 42.60 + 60.21 = 60.(37 + 42 + 21) = 60.100 = 6000
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`15*37*4+120*21+21*5*12`
`=60*37+60*2*21+60*21`
`=60(37+42+21)`
`=60*100`
`=6000`
![](https://rs.olm.vn/images/avt/0.png?1311)
=(15.4).37+60.2.21+(12.5).21
=60.37+60.42+60.21
=60.(37+42+21)
=60.100
=6000
= 15 . 37 . 4 + 15 . 8 + 3 . 7 + 3 .7 . 5 . 12
= 15 . 37 . 4 + 15 . 8 + 3 . 7 + 15 . 7 . 12
= 15 . (37 . 4 + 8 + 3 . 7 + 7 . 12)
= 15 . 261
= 3915
tick đúng cho tớ nhé !
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a) \(\text{13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 }\)
\(\text{=(13 x 4 ) x 58 + 32 x 13 x 2 x 2 + 13 x 4 x 10}\)
\(\text{= ( 13 x 4 ) x 58 + 32 x ( 13 x 2 x 2 ) + ( 13 x 4 ) x 10 }\)
\(\text{= 52 x 58 + 32 x 52 + 52 x 10}\)
\(\text{=52 x ( 58 + 32 + 10 )}\)
\(\text{=52 x 100 = 5200}\)
b) \(\text{14 x 35 x 5 + 10 x 25 x 7 + 20 x 70 x 2}\)
\(\text{= ( 14 x 5 ) x 35 + (10 x 7 ) x 25 + 20 x 70 x 2 }\)
\(\text{= 70 x 35 + 70 x 25 + 20 x 2 x 70 }\)
\(\text{= 70 x ( 35 + 25 + 40 )}\)
\(\text{= 70 x 100 = 7000 }\)
e) \(\text{5.3.37.4+5.24.21+21.5.12}\)
\(\text{= 5.(3.37.4+24.21+21.12)}\)
\(\text{= 5.1200}\)
\(=6000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1365 x 89 - 89 x 365 = 89 x (1365 - 365) = 89 x 1000 = 89000
13 x 58 x 4 + 32 x 26 x 2 + 52 x 10 = 52 x 58 + 32 x 52 + 52 x 10 = 52 x (58 + 32+ 10) = 52 x 100 = 5200
15 x 37 x 4 + 120 x 21 + 21 x 5 x 12 = 60 x 37 + 60 x 2 x 21 + 21 x 60 = 60 x (37 + 2 x 21 + 21) = 60 x 100 =6000