9 x 3 + 67 : 8 = ?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2/9 - (1/20 + 2/9)
= 2/9 - 1/20 - 2/9
= (2/9 - 2/9) - 1/20
= 0 - 1/20
= -1/20
b) -3/14 + 2/13 + (-25/14) + (-15/13)
= (-3/14 - 25/14) + (2/13 - 15/13)
= -2 - 1
= -3
c) -3/11 + 11/8 - 3/8 + (-8/11)
= (-3/11 - 8/11) + (11/8 - 3/8)
= -1 + 1
= 0
d) 3/8 + (-1/4) - (7/12 - 1/6)
= 1/8 - 5/12
= -7/24
e) (1/3 + 12/67 + 13/41) - (79/67 - 28/41)
= 1/3 + 12/67 + 13/41 - 79/67 + 28/41
= 1/3 + (12/67 - 79/67) + (13/41 + 28/41)
= 1/3 - 1 + 1
= 1/3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(67-\left[8+7.3^2-24:6+\left(9-7\right)^3\right]:15\)
\(67-\left[8+7.9-4+2^3\right]:15\)
\(67-\left[8+63-4+8\right]:15\)
\(67-\left[71-11\right]:15\)
\(67-60:15\)
\(67-4\)
\(=63\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (123-4x)-67=8
123-4x =8+67
123-4x =73
4x =123-73
4x =60
x =60:4
x =15
a)(123-4x)-67= 8 =(123-4x) =8+67 = 4x =123-75 4x=48 x=48:4 x=12
![](https://rs.olm.vn/images/avt/0.png?1311)
67-[8+7.\(3^2\)-24:6+\(\left(9-7\right)^3\)]:15
=67-[8+63-4+8]:15
=67-75:15
=67-5
=62
67 -[ 8 + 7 x 32 - 24: 6 + (9 - 7 )3] :15
= 67 -[ 8 + 7 . 32 - 24 : 6 + 23 ] : 15
= 67 - [ 8 + 7 . 9 - 24 : 6 + 8 ] : 15
= 67 - [ 71 - 12 ] : 15
= 67 - 59 : 15
= 8 : 15
=> ko thực hiện đc .
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(8000\times6=48000\)
\(7\times9000=63000\)
\(14000\times4=56000\)
\(3\times29000=87000\)
\(27000\times3=81000\)
\(46000\times2=92000\)
35,375
#Hok tốt
NHAN CHIA TRUOC OKEEEEEEE