/ x – 6 = - 3
b/ 3x + 17 = 29
c/ 2x + 11 = 15
-17.(-3)-(x+29)=-11-3x
15-2x=-11-3x
-17-4x=-19.3-2x
46-(52-x)=12.(-7)+2x
Tìm x , y biết
a ) x mũ 2 = x mũ 5
b ) ( 3x - 12 )mũ 15 = ( x - 17)mũ 15
c ) ( 4x - 16 )mũ 15 - ( x - 2 )mũ 15 = 0
d ) ( x - 3 )mũ 11 = ( 2x - 6 )mũ 11
bạn có thể check lại đề bài câu a được không ạ
a, 2.x + 7 = 15
b, 25 – 3.(6 – x) = 22
c, [(2x – 11) : 3 + 1].5 = 20
d, (25 – 2x)3 : 5 – 32 = 42
e, 2 . 3x = 10 . 312 + 8 . 274
g, x – 12 = (–8) + (–17)
h, 7 – 2x = 18 – 3x
i, 3(x + 5) – x – 11 = 24
a, 2.x + 7 = 15
2x = 8
x = 4
b, 25 – 3.(6 – x) = 22
3.(6-x) = 3
6-x = 1
x = 5
c, [(2x – 11) : 3 + 1].5 = 20
(2x-11) : 3+1 = 4
(2x-11):3 = 3
2x-11 = 1
2x = 12
x = 6
e, 2 . 3x = 10 . 312 + 8 . 274
6x = 3120 + 2192
6x = 5312
x = 5312/6
g, x – 12 = (–8) + (–17)
x - 12 = -25
x = -13
Lần sau tách nhỏ nội dung câu hỏi ra nha em, chứ trả lời thế này biếng lắm '^^ Chị làm chỉ mang tính tham khảo kết quả thôi, còn cụ thể thì em tách từng bước một ra he :>
a, \(2\cdot x+7=15\)
\(\Leftrightarrow2\cdot x=8\)
\(\Leftrightarrow x=4\)
Vậy x = 4.
b, \(25-3\cdot\left(6-x\right)=22\)
\(\Leftrightarrow3\cdot\left(6-x\right)=3\)
\(\Leftrightarrow6-x=1\)
\(\Leftrightarrow x=5\)
Vậy x = 5.
c, \(\left[\left(2x-11\right):3+1\right]\cdot5=20\)
\(\Leftrightarrow\left(2x-11\right):3+1=4\)
\(\Leftrightarrow\left(2x-11\right):3=3\)
\(\Leftrightarrow2x-11=9\)
\(\Leftrightarrow2x=20\)
\(\Leftrightarrow x=10\)
Vậy x = 10.
d, \(\left(25-2x\right)\cdot3:5-32=42\)
\(\Leftrightarrow\)\(\frac{3\cdot\left(25-2x\right)}{5}=74\)
\(\Leftrightarrow3\cdot\left(25-2x\right)=370\)
\(\Leftrightarrow25-2x=\frac{370}{3}\)
\(\Leftrightarrow2x=-\frac{295}{3}\)
\(\Leftrightarrow x\approx49\)
Vậy \(x\approx49\) .
e, \(2\cdot3x=10\cdot312+8\cdot274\)
\(\Leftrightarrow6x=5312\)
\(\Leftrightarrow x=5312:6\approx885\)
Vậy \(x\approx885\) .
g, \(x-12=\left(-8\right)+\left(-17\right)\)
\(\Leftrightarrow x-12=-25\)
\(\Leftrightarrow x=-25+12=-13\)
Vậy x = -13.
h, \(7-2x=18-3x\)
\(\Leftrightarrow-2x+3x=18-7\)
\(\Leftrightarrow x=11\)
Vậy \(x=11\) .
i, \(3\cdot\left(x+5\right)-x-11=24\)
\(\Leftrightarrow3x+15-x-11=24\)
\(\Leftrightarrow2x=24+11-15\)
\(\Leftrightarrow2x=20\)
\(\Leftrightarrow x=10\)
Vậy \(x=10\) .
Thanks mn ^v^
a) -2x - (-17)= 9 b) 11 + (15 – x) = 1
c) 53 – 7x = 57 : 55 |
b) 11 + (15 – x) = 1
d) 29 +9.x2 = 110
e) (2x-4).(3-x) = 0
g) 2x + 1 chia hết cho x -2
b: =>15-x=-10
hay x=25
a: =>-2x+17=9
=>-2x=-8
hay x=4
d: \(\Leftrightarrow9x^2=81\)
hay \(x\in\left\{3;-3\right\}\)
e: \(\Leftrightarrow\left[{}\begin{matrix}2x-4=0\\3-x=0\end{matrix}\right.\Leftrightarrow x\in\left\{2;3\right\}\)
Tìm x biết:
a)5x+ 3x =36.33.4+12
b)5x+x=39-311
c)7x-2x=617:615+44:11
Tìm x:
a) 3x + 17 = 2
b) 2x + 11 = 3 (x - 9)
2x2 - 3 = 29
b) 2x+11=3(x-9)
=> 2x+11= 3x-27
=> 2x=3x-38
=> 2x+38=3x
=> 38=3x-2x
=> 38=x
c) 2x2-3=29
=> 2x2=29+3
=> 2x2=32
Vì ko có số bào mà bình phương của nó bằng 32
=> x ko tồn tại
1. 3y = 0
2. 1+x=0
3. 1-2t=0
4. 2x+x+3=0
5. 25x-20=0
6. 51x=17
7. 2x-3=x+5
8. x-8=2x+3
9. 17-2x=3x-5
10. 2x+x+22=0
11. x-3=3x+5
12.15x+1/2=0
13. 3x+1=7x-11
14. 5-3x=6x+7
15. 11-2x=x-1
16. 15-8x=9-5x
17. 25-3x=4x-5
18. 0,25x+1,5=0
19. 3x-5/6=1/2
20. -2x+14=0
giúp mik nha chìu nay mik cần gấp
thanks
1. 3y = 0
=> y = 0
2. 1+x = 0
<+ x = -1
3.
\(1-2t=0\)
\(\Leftrightarrow2t=1\)
\(\Leftrightarrow\dfrac{1}{2}\)
4. 2x +x + 3 =0
\(\Leftrightarrow3x+3=0\)
\(\Leftrightarrow x=-3\)
5.
\(25x-20=0\)
\(\Leftrightarrow25x=20\)
\(\Leftrightarrow x=\dfrac{4}{5}\)
7.
2x-3 = x+5
<=> 2x - x = 5+3
<=> x = 8
8.
x-8=2x+3
<=> x - 2x = 3+8
<=> -x = 11
<=> x = -11
9. 17-2x = 3x-5
<=> -2x-3x = -5-17
<=> -5x = -22
<=> x = \(\dfrac{22}{5}\)
10.
2x+x+22=0
<=> 3x+22=0
<=> 3x = -22
<=> x = \(\dfrac{-22}{3}\)
Mấy bài kia tự giải tương tự nhá!!!
11.
x-3=3x+5
<=> x-3x=5+3
<=> -2x=8
<=> x = -4
12. 15x + 1/2 = 0
<=> 15x = -1/2
<=> x = -1/30
13.
3x+1 = 7x-11
<=> 3x-7x = -11-1
<=> -4x=-12
<=> x = 3
14.
5-3x = 6x + 7
<=> -3x-6x = 7-12
<=> -9x = -5
<=> x = 5/9
15.
11-2x=x-1
<=> -2x-x = -1-11
<=> -3x = -12
<=> x = 4
16.
15 - 8x = 9-5x
<=> -8x+5x = 9 - 15
<=> -3x = -6
<=> x=2
17.
25-3x=4x-5
<=> -3x-4x = -5-25
<=> -7x = -30
<=> x = 30/7
18.
0,25x+1,5=0
<=> 0,25x = -1,5
<=> x = -6
19.
3x-5/6 = 1/2
<=> 3x - 5/6 = 3/6
<=> 3x-5=3
<=> 3x = 8
<=> x = 8/3
20.
-2x + 14 =0
<=> -2x = -14
<=> x = 7
a) -2x - (-17)= 9 b) 11 + (15 – x) = 1
c) 53 – 7x = 57 : 55 | d) 29 +9.x2 = 110 |
e) (2x-4).(3-x) = 0
g) 2x + 1 chia hết cho x -2 |
a: =>-2x=9-17=-8
hay x=4
b: =>15-x=-10
hay x=25
d: \(\Leftrightarrow9x^2=81\)
hay \(x\in\left\{3;-3\right\}\)
e: \(\Leftrightarrow\left[{}\begin{matrix}2x-4=0\\3-x=0\end{matrix}\right.\Leftrightarrow x\in\left\{2;3\right\}\)
tim x thuoc Z biết
a) 13- ( 2x-11 ) =-15
b) 17-(13-2x) =x+11
c) 17-/ 3x-2 / =7
d) / 4x/ =2x+2
các bn oi dau / nay la gia tri tuyet doi day
a) 13 - ( 2x - 11 ) = -15
=> 2x - 11 = 13 - ( -15 )
=> 2x - 11 = 28
=> 2x = 28 + 11
=> 2x = 39
=> x = 39 : 2
=> x = 19,5
Mấy câu khác bn tự giải nha!Cũng tương tự như vậy thôi!
a/ \(13-\left|2x-11\right|=-15\)
\(\Leftrightarrow\left|2x-11\right|=28\)
\(\Leftrightarrow\orbr{\begin{cases}2x-11=28\\2x-11=-28\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=19,5\\x=-8,5\end{cases}}\)
Vậy ...
b/ \(17-\left(13-2x\right)=x+11\)
\(\Leftrightarrow17-13+2x=x+11\)
\(\Leftrightarrow5+2x=x+11\)
\(\Leftrightarrow2x-x=11-5\)
\(\Leftrightarrow x=6\)
Vậy ,,,
b/ \(17-\left|3x-2\right|=7\)
\(\Leftrightarrow\left|3x-2\right|=10\)
\(\Leftrightarrow\orbr{\begin{cases}3x-2=10\\3x-2=-10\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}3x=12\\3x=-8\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=4\\x=-\frac{8}{3}\end{cases}}\)
Vậy ...
d/ \(\left|4x\right|=2x+2\)
\(\Leftrightarrow\orbr{\begin{cases}2x+2=4x\\2x+2=-4x\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x-4x=2\\2x+4x=2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}-2x=2\\6x=2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-1\\x=\frac{1}{3}\end{cases}}\)