![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>2x=-18+5=-13
=>x=-13/2
b: =>3^x-1=81
=>x-1=4
=>x=5
c: =>4(5-x)=24
=>5-x=6
=>x=-1
![](https://rs.olm.vn/images/avt/0.png?1311)
`2x-15 = 17``
`=> 2x = 17 + 15`
`=> 2x = 32`
`=> X = 32 : 2`
`=> x = 16`
`156 - (x + 61) = 82`
`=> x + 61 = 156 - 82`
`=> x + 61 = 74`
`=> x = 13`
`2x - 138 = 2^3 . 3^2`
`=>2x - 138 = 72`
`=> 2x = 210`
`=> x = 105`
bài 2:
`23-3x = 8`
`=> 3x = 23 - 8`
`=> 3x = 15`
`=> x = 5`
`(x-35) - 120 = 0`
`=>(x-35) = 120`
`=> x = 120 +35`
`=> x = 155`
`3^x + 2 = 29`
`=> 3^x = 27`
`=> 3^x = 3^3`
`=> x = 3`
![](https://rs.olm.vn/images/avt/0.png?1311)
a, - ( x + 84 ) + 213 = -16
=> - ( x + 84 ) = -16 - 213
=> - ( x + 84 ) =-229
=> x + 84 = 229
=> x = 145
b. x + ( -35 ) = 18
=> x = 18 - ( -35 )
=> x = 18 + 35
=> x = 53
c. -2x - ( - 17 ) = 15
=> -2x = 15 + ( -17)
=> -2x = -2
=> x = 1
\(a,-\left(x+84\right)+213=-16\)
\(x+84=213+16\)
\(x+84=229\)
\(x=229-84\)
\(x=145\)
\(b,x+\left(-35\right)=18\)
\(x=18+35\)
\(x=53\)
\(c,-2x-\left(-17\right)=15\)
\(-2x+17=15\)
\(2x=17-15\)
\(2x=2\)
\(x=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 78 - x = 90
x = 78 - 90
x = -12
b) 15 + 2x = 5¹⁰ : 5⁸
15 + 2x = 5²
15 + 2x = 25
2x = 25 - 15
2x = 10
x = 10 : 2
x = 5
c) 48 : x + 17 = -33
48 : x + 17 = -33 - 17
48 : x = -50
x = 48 : (-50)
x = -24/25
d) Do x ⋮ 15 và x ⋮ 20
⇒ x ∈ BC(15; 20)
Ta có:
15 = 3.5
20 = 2².5
⇒ BCNN(15; 20) = 2².3.5 = 60
⇒ x ∈ BC(15; 20) = {0; 60; 120; ...}
Mà 50 < x < 70
⇒ x = 60
![](https://rs.olm.vn/images/avt/0.png?1311)
X + (- 35 ) = 18
X - 35 = 18
X = 18 + 35
X = 53
Vậy X = 53
- 2x -(- 17)= 15
- 2x + 17 = 15
- 2x = 15 - 17
- 2x = - 2
x = - 2 : ( - 2 )
x = 1
Vậy x = 1
1) x+ (-35)=18
<=> x-35=18
<=> x=53
2) -2x-(-17)=15
<=> -2x+17=15
<=> -2x=-2
<=> x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
Giải:
a) \(\left(x-1\right)\left(y+2\right)=7\)
\(\Rightarrow\left(x-1\right)\) và \(\left(y+2\right)\inƯ\left(7\right)=\left\{\pm1;\pm7\right\}\)
Ta có bảng giá trị:
x-1 | -7 | -1 | 1 | 7 |
y+2 | -1 | -7 | 7 | 1 |
x | -6 | 0 | 2 | 8 |
y | -3 | -9 | 5 | -1 |
Vậy \(\left(x;y\right)=\left\{\left(-6;-3\right);\left(0;-9\right);\left(2;5\right);\left(8;-1\right)\right\}\)
b) \(\left(x-2\right)\left(3y+1\right)=17\)
\(\Rightarrow\left(x-2\right)\) và \(\left(3y+1\right)\inƯ\left(17\right)=\left\{\pm1;\pm17\right\}\)
Ta có bảng giá trị:
x-2 | -17 | -1 | 1 | 17 |
3y+1 | -1 | -17 | 17 | 1 |
x | -15 | 1 | 3 | 19 |
y | \(\dfrac{-2}{3}\) (loại) | -6 (t/m) | \(\dfrac{16}{3}\) (loại) | 0 (t/m) |
Vậy \(\left(x;y\right)=\left\{\left(1;-6\right);\left(19;0\right)\right\}\)
Ko ghi lại đề nhé
a) \(TH1\left[{}\begin{matrix}x-1=1\\y+2=7\end{matrix}\right.=>\left[{}\begin{matrix}x=2\\y=5\end{matrix}\right.\)
\(TH2:\left[{}\begin{matrix}x-1=-1\\y+2=-7\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\y=-9\end{matrix}\right.\)
\(TH3:\left[{}\begin{matrix}x-1=7\\y+2=1\end{matrix}\right.=>\left[{}\begin{matrix}x=8\\y=-1\end{matrix}\right.\)
\(TH4:\left[{}\begin{matrix}x-1=-7\\y+2=-1\end{matrix}\right.=>\left[{}\begin{matrix}x=-6\\y=-3\end{matrix}\right.\)
b) \(TH1:\left[{}\begin{matrix}x-2=1\\3y+1=17\end{matrix}\right.=>\left[{}\begin{matrix}x=3\\y=\dfrac{16}{3}\end{matrix}\right.=>Loại\)
\(TH2:\left[{}\begin{matrix}x-2=-1\\3y+1=-17\end{matrix}\right.=>\left[{}\begin{matrix}x=1\\y=-6\end{matrix}\right.Chọn\)
\(TH3:\left[{}\begin{matrix}x-2=17\\3y+1=1\end{matrix}\right.=>\left[{}\begin{matrix}x=19\\y=0\end{matrix}\right.=>Chọn\)
\(TH4:\left[{}\begin{matrix}x-2=-17\\3y+1=-1\end{matrix}\right.=>\left[{}\begin{matrix}x=-15\\y=\dfrac{-2}{3}\end{matrix}\right.=>Loại\)
Bạn tự kết luận hộ mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
a: -2*(-27)=54
6*9=54
=>Hai phân số này bằng nhau
b: -1/-5=1/5=5/25<>4/25
Bài 3:
a: =>16/x=-4/5
=>x=-20
b: =>(x+7)/15=-2/3
=>x+7=-10
=>x=-17
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 416 + ( x-45 )= 387
416-45+x=387
x=387-(416-45)
x=16
b) 11-(x+84)=97
11-x-84=97
-x=84-11+97
-x=170
x=-170
c) -(x+84)+213=-16
-x-84+213=-16
-x=-16-213+84
-x=-145
x=145
d)x+(-35)=18
x-35=18
x=53
e) -2x-(-17)=15
-2x+17=15
-2x=-2
x=1
P/s tham khảo nha
A) 416 + (X-45) =387
416+X-45= 387
416-45+X=387
371+X=387
X=387-371
X=16
B) 11-(X+84)=97
11-X-84=97
11-84-X=97
-73-X=97
X=-73-97
X=-170
C) -(X+84) +213=-16
-X-(84-213) =-16
-X-(-129)=-16
-X=(-16)+(-129)
-X= -145
X=145
D) X+(-35)=18
X=18-(-35)
X=53
E) -2X-(-17) =15
-2X+17=15
-2X=15-17
-2X=-2
X=-2:-2
X=1
![](https://rs.olm.vn/images/avt/0.png?1311)
a)2x-35=15
2x=15+35
2x=50
x=50:2
x=25
b)3x+17=2
3x=2-17
3x=-15
x=-15:3
x=-5
c)|x-1|=0
=>x-1=0=>x=0-1
=>x=-1
a)2x-35=15
2x=15+35
2x=50
x=50:2
x=25
b)3x+17=2
3x=2-17
3x=-15
x=-15:3
x=-5
c)|x-1|=0
x-1=0
x=0+1
x=1
a) x+(-35)=18
x-35=18
x=18+35
x=53
vậy x=53
b) -2x-(-17)=15
-2x+17=15
-2x=15-17
-2x=-2
x=-2:(-2)
x=1
vậy x=1
x+(-35)=18
x=18-(-35)
x=-17