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`a,`
`x*3+7=16`
`=>3x = 16 - 7`
`=> 3x = 9`
`=> x = 9 \div 3`
`=> x = 3`
Vậy, `x = 3`
`b,`
` x- 152 \div 2 = 46?`
`=> x - 76 = 46`
`=> x = 46 + 76`
`=> x = 122`
Vậy, `x = 122.`
`c,`
` 74-2*(x+3)=34`
`=> 2(x + 3) = 74 - 34`
`=> 2(x+2) = 40`
`=> x + 2 = 40 \div 2`
`=> x + 2 = 20`
`=> x = 20 - 2`
`=> x = 18`
Vậy, `x = 18.`
![](https://rs.olm.vn/images/avt/0.png?1311)
c)34, 72 32,28 : 5 – 57,25 – 36, 05 : 2
=(34,72+32,28):5-(57,25-36,05):2
=67 : 5 - 21,2 : 2
=13,4 - 10,6
=2,8
e)5, 36.12, 34 ( 5, 36).2, 34
=5,36.12,34−5,36.2,34
=5.36.(12,34−2,34)
=5,36.10
=53,6
![](https://rs.olm.vn/images/avt/0.png?1311)
b ) -2(3x+2)-3 =28
-6x-4-3=28
-6x = 28 +4+3
-6x = 35
x =\(\dfrac{35}{-6}\)= \(\dfrac{-35}{6}\)= -5,8
vậy x= -5,8
c ) -(x+3)-5(x-7)=10x-20
-(x+3)-5x+35=10x-20
-x+3-5x+35=10x-20
-x-5x-10x=-20-3-35
-16x=-58
x=\(\dfrac{-58}{-16}\)=\(\dfrac{58}{16}\)=3,625
vậy x =3,625
d)2x+37=-6(3x-8)
2x+37=-18x+48
2x+18x=48-37
20x=11
x=\(\dfrac{11}{20}\)=0,55
vậy x=0,55
![](https://rs.olm.vn/images/avt/0.png?1311)
\(6-\left(3x-\frac{1}{3}\right)=2x+\frac{1}{3}\)
\(\Leftrightarrow6-\left(3x-\frac{1}{3}\right)-2x-\frac{1}{3}=0\)
\(\Leftrightarrow6-3x+\frac{1}{3}-2x-\frac{1}{3}=0\)
\(\Leftrightarrow-5x+6=0\)
\(\Leftrightarrow6=5x\)\(\Leftrightarrow x=\frac{6}{5}\)
Học tút!
![](https://rs.olm.vn/images/avt/0.png?1311)
(3x -48) .6 =3^2 . 2^2 + 2^3 . 3^2 - 12
(3x-48) .6 =3^2(2^2+2^3) -12
(3x-48) .6 =3^2.12-12
(3x-48) .6 =9.12-12
(3x-48) .6 =8.12
(3x-48) .6 =96
3x-48 =96:6
3x-48=16
3x=16+48
3x=64
x=64:3
x=64/3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,3x-6=5x+2\)
\(3x-5x=2+6\)
\(-2x=8\)
\(x=-4\)
\(b,2\times\left(x-3\right)-3\times\left(x+7\right)=14\)
\(2x-6-3x-21=14\)
\(-x-27=14\)
\(x=-27-14\)
\(x=-41\)
a) 3x - 6 = 5x + 2
3x - 6 - 2 = 5x
3x - 8 = 5x
3x - 5x = 8
-2x = 8
x = -4
b) 2(x - 3) - 3(x + 7) = 14
2x - 6 - 3x - 21 = 14
(-x) - 27 = 14
(-x) = 41
x = -41
c) 3x2 - x - 2 = 0
x.(3x - 1) = 2
x.(3x - 1) = 2 = 1.2 = 2.1 = (-1).(-2) = (-2).(-1)
Xét 4 trường hợp ,ta có :
\(\left(1\right)\hept{\begin{cases}x=1\\3x-1=2\end{cases}\Rightarrow\hept{\begin{cases}x=1\\x=1\end{cases}}}\)(nhận)
\(\left(2\right)\hept{\begin{cases}x=2\\3x-1=1\end{cases}\Rightarrow\hept{\begin{cases}x=2\\x=\frac{2}{3}\end{cases}}}\)(loại)
\(\left(3\right)\hept{\begin{cases}x=-1\\3x-1=-2\end{cases}\Rightarrow\hept{\begin{cases}x=-1\\x=-\frac{1}{3}\end{cases}}}\)(loại)
\(\left(4\right)\hept{\begin{cases}x=-2\\3x-1=-1\end{cases}\Rightarrow\hept{\begin{cases}x=-2\\x=0\end{cases}}}\)(loại)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
3x=24-6+6>3.2
3x=24>6
x=24:3>6
x=8>6
Ai có lòng tốt
cho mình một
tích đúng nhé.
Ta có
\(3x=24-6+6>3\times2\)
\(3x=24>6\)
\(3x=24-6>0\)
\(3x=18>0\)
\(x=6>0\)
Nếu đúng thì k nhé !
(3x-6).3=34
(3x-6)=34:3
(3x-6)=33
(3x-6)=27
3x=27+6
3x=33
=>x=11
t tôi nha bn