Ta có:

67 - [ 8 + 7 . 3² - 24 : 6 + ( 9 - 7 )³ ] : 15 

= 67 - (8 + 7.9 - 4 + 8) : 15

= 67 - 75 : 15

= 67 - 5

= 62

\(67-\left[8+7.3^2-24:6+\left(9-7\right)^3\right]:15\\ =67-\left[8+7.9-4+2^3\right]:15\\ =67-\left[8+63-4+8\right]:15\\ =67-75:15\\ =67-5=62\)

cảm ơn bạn Nguyễn Hòang tùng nhé

`a,`

`31/23-(7/32+8/23)`

`=31/23-7/32-8/23`

`=(31/23-8/23)-7/32`

`=1-7/32=25/32`

`b,`

`38/45-(8/45-17/51-3/11)`

`=38/45-8/45+17/51+3/11`

`= (38/45-8/45)+17/51+3/11`

`=2/3+17/51+3/11`

`=1+3/11=14/11`

`c,`

`(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+(-1+1)=1/3+0=1/3`

`d,`

`1/5+(-1/6)+1/7+(-1/8)+1/9+1/8+(-1/7)+1/6+(-1/5)`

`= (1/5+ -1/5)+(-1/6+1/6)+(1/7+ -1/7)+(-1/8 +1/8)+1/9`

`= 0+0+0+0+1/9=1/9 .`

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 .

=???

ok chị

cái nịt

1. \(x-8+32=68\)

\(x-8=68-32\)

\(x-8=36\)

\(x=36+8\)

\(x=44\)

_____

2. \(x+8+32=68\)

\(x+8=68-32\)

\(x+8=36\)

\(x=36-8\)

\(x=28\)

_____

3. \(98-x+34=43\)

\(98-x=43-34\)

\(98-x=9\)

\(x=98-9\)

\(x=89\)

_____

4. \(98+x-34=43\)

\(98+x=43+34\)

\(98+x=77\)

\(x=77-98\)

\(x=-21\)

_____

5. \(x:5:4=800\)

\(x:5=800.4\)

\(x:5=3200\)

\(x=3200.5\)

\(x=16000\)

_____

6. \(18+x=384:8\)

\(18+x=48\)

\(x=48-18\)

\(x=30\)

_____

7. \(\left(84,6-2\times x\right):3,02=5,1\)

\(84,6-2.x=5,1.3,02\)

\(84,6-2.x=15,402\)

\(2.x=84,6-15,402\)

\(2.x=69,198\)

\(x=69,198:2\)

\(x=34,599\)

_____

8. \(x\times5=120:6\)

\(x.5=20\)

\(x=20:5\)

\(x=4\)

_____

9. \(\left(15\times24-x\right):0,25=100:0,25\)

\(\left(15.24-x\right):0,25=400\)

\(15.24-x=400.0,25\)

\(15.24-x=100\)

\(360-x=100\)

\(x=360-100\)

\(x=260\)

1,x-8+32=68

=>x-8=68-32=36

=>x=36+8=42

2,x+8+32=68

=>x+8=68-32=36

=>x=36-8=28

3,98-x+34=43

=>98-x=43-34=9

=>x=98-9=89

4,98+x-34=43

=>98+x=43+34=77

=>x=77-98=-21

5,x:5:4=800

=>x:20=800

=>x=800x20=16000

6,18+x=384:8=48

=>x=48-18=30

7,(84,6-2x):3,02=5,1

=>84,6-2x=5,1x3,02=15,402

=>2x=84,6-15,402=69,198

=>x=69,198:2=34,599

8,5x=120:6=20

=>x=20:5=4

9,(15x24-x):0,25=100:0,25=400

=>360-x=400x0,25=100

=>x=360-100=260.

đổi ra thì ta có:

67-[8+7.9-24:6+(9-7)^3]:15

=67-[8+63-4+2^3]:15

=67-[8+63- 4+8]:15

=67-[71-4+8]:15

=67-75:15

=67-5

=62

67 - [ 8 + 7 . 3² - 24 : 6 + ( 9 - 7 )³ ] : 15

= 67 - [ 8 + 7 . 9 - 4 + 2³ ] : 15

= 67 - [ 8 + 63 - 4 + 8 ] : 15

= 67-[71-4+8]:15

= 67 - [ 67 + 8 ] : 15

= 67 - 75 : 15

= 67 - 5

= 62