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a)\(\left(9x-2^3\right):5=2\)
\(9x-8=2.5\)
\(9x-8=10\)
\(9x=10+8\)
\(9x=18\)
\(x=18:9\)
\(x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-x + 20 = - (-15) - (8) + 13
-x + 20 = 15 - 8 + 13
-x + 20 = 7 + 13
- x + 20 = 20
x = 20 - 20
x = 0
-(-10) + x = -13 + (-9) + (-6)
10 + x = -13 - 9 - 6
10 + x = -28
x = -28 - 10
x = -38
![](https://rs.olm.vn/images/avt/0.png?1311)
1. -x+20 = -(-15)-8+13
=> -x=15-8+13-20
=> -x=0
=> x=0
2. -(-10)+x=-13+(-9)+(-6)
=> 10+x=-13-9-6
=> x = -13-9-6-10
=> x = -38
3. 8-(-12)+10=-(-14)-x
=> 8+12+10=14-x
=> x = 14-8-12-10
=> x = -16
4. -(+12)+(-x)-(-3)=5-(-7)
=> -12-x+3=5+7
=> -x=5+7+12-3
=> -x=21
=> x=-21
5. 14-x+(-10)=-(-9)+(+15)
=> 14-x-10=9+15
=> -x=9+15-14+10
=> -x=20
=> x=-20
6. 12-(-17)+(-3)=-5+x
=> 12+17-3+5=x
=> x=31
7. x-(-19)-(+32)=14-(+16)
=> x+19-32=14-16
=> x=14-16+32-19
=> x=11
8. x-|-15|-|7|=-(-9)+|-5|
=> x-15-7=9+5
=> x=9+5+7+15
=> x=36
9. 15-x+17=13-(-21)
=> 15-x+17=13+21
=> -x=13+21-15-17
=> -x=2
=> x=-2
10. -|-5|-(-x)+4=3-(-25)
=> -5+x+4=3+25
=> x=3+25-4+5
=> x=29
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\left(9^4.8+9^4.5\right):\left(9^2.\left(10-1\right)\right)\)
=\(9^4.13:9^3=13.9=117\)
b) 100-(75-25)=100-50=50
`a, (9x - 2^3):5 = 2`
`=> 9x - 8 = 2 . 5`
`=> 9x - 8 = 10`
`=> 9x = 18`
`=> x=18:9`
`=> x=2`
Vậy: `x=2`
`b, [3^4 - (8^2+14):13]x = 5^3 + 10^2`
`=> [81 - 78 : 13]x = 125 + 100`
`=> [81-6]x = 225`
`=> 75x = 225`
`=> x=225:75`
`=> x=3`
Vậy: `x=3`
a, \(\left(9x-2^3\right):5=2\)
\(\left(9x-8\right)=5.2\)
\(9x-8=10\)
\(9x=10+8\)
\(9x=18\)
\(x=18:9\)
\(x=2\)
Vậy: x=2
b, \(\left[3^4-\left(8^2+14\right):13\right]x=5^3+10^2\)
\(\left[81-\left(64+14\right):13\right]x=125+100\)
\(\left[81-78:13\right]x=225\)
\(\left[81-6\right]x=225\)
\(75x=225\)
\(x=225:75\)
\(x=3\)
Vậy: x=3