Tìm x biết : 2x+12=3(x-7)
Bài 4: Tìm số nguyên x biết:
a) 3x + 27 = 9 b) 2x + 12 = 3(x – 7)
c) 2x2 – 1 = 49 d) |-9 – x| -5 = 12
b) 2x + 12 = 3(x – 7)
d) |-9 – x| -5 = 12
Bài 13: Tìm x biết: a) (x-2)(x-3)-D0. b) (x-3)(x-4)-0. c) (x-7)(6-x)=0. d) (x-3)(x-13)=0. The Bài 14: Tìm x biết: a) (12-x)(2-x)=0. b) (x-33)(11-x)=0. c) (21-x)(12-x)=0. d) (50-x)(x-150) =0. Bài 15: Tìm x biết: a) 2x +x = 45. b) 2x +7x = 918. c) 2x+3x 60+5. d) 11x+22x 33.2.
Tìm x biết: 2x+12=3(x-7)
2x+12=3(x-7)
2x+12=3x-21
3x-2x=12+21
x=33
vậy x=33
2x + 12 = 3 ( x - 7 )
2x + 13 = 3x - 3. 7
2x + 13 = 3x - 21
- 3x + 2x = -13 - 21
-1x = -34
x = -34 : ( - 1 )
x = 34
Tìm x biết 2x+12=3.(x-7)
\(2x+12=3.\left(x-7\right)\)
\(=>2x+12=3x-21\)
\(=>-x=-21-12=-33\)
\(=>x=33\)
2x+12=3.(x-7)
<=>2x+12=3x-21
<=>2x-3x=-21-12
<=>-x=-33
<=>x=33
Tìm x, biết : 2x + 12 = 3 . ( x + 7 )
2.x+12=3.x+21
2.x-3.x=21-12
(2-3).x=9
-1.x=9
x=9:-1
x=-9
Vậy x=-9
tìm x,biết
5.(x+7)-3.(2-x)
12(x-3)=5(x-1)+4
(-6).(x-7)+2(x+10)=x-18
7.(2x-1)-12(x-5)=3
|2x-1|=17
|8-3x|=14
5.(x+7)=3.(2-x)
=>5x+35=6-3x
=>5x+3x=6+41
=>8x=47
=>x=47:8=47/8
tìm x,biết
5(x+7)-3(2-x)
12(x-3)=5(x-1)+4
(-6).(x-7)+2(x+10)=x-18
7(2x-1)-12(x-5)=3
|2x-1|=17
|8-3x|=14
\(12\left(x-3\right)=5\left(x-1\right)+4\)
\(\Rightarrow12x-36=5x-5+4\)
\(\Rightarrow12x-5x=-5+4+36\)
\(\Rightarrow7x=35\)
\(\Rightarrow x=5\)
\(-6\left(x-7\right)+2\left(x+10\right)=x-18\)
\(-6x+42+2x+20=x-18\)
\(-6x+2x-x=-18-20-42\)
\(-5x=-80\)
\(x=16\)
\(7\left(2x-1\right)-12\left(x-5\right)=3\)
\(\Rightarrow14x-7-12x+60=3\)
\(\Rightarrow14x-12x=3-60+7\)
\(\Rightarrow2x=-50\)
\(\Rightarrow x=-25\)
\(\left|2x-1\right|=17\)
\(\Leftrightarrow\orbr{\begin{cases}2x-1=17\\2x-1=-17\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=9\\x=-8\end{cases}}\)
\(\left|8-3x\right|=14\)
\(\Leftrightarrow\orbr{\begin{cases}8-3x=14\\8-3x=-14\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-2\\x=\frac{22}{3}\end{cases}}\)
bài 2 tìm x biết
a 13/4 + x = 2
b 2x.17/12 = 3/7
c 2x.17/12= 19/7
d 1/2x + 5/6 = -3
a)
13/4+x=2
x=2-13/4
x=-5/4
b)
2x.17/12=3/7
2x =3/7;17/12
2x =36/119
x =36/119 : 2
x =18/119
c)
2x.17/12=19/7
2x =19/7:17/12
2x =228/119
x =228/119;2
x =114/119
d)
1/2x + 5/6=-3
1/2x =-3-5/6
1/2x =-23/6
x =-23/6:1/2
x =-23/3
Tìm số nguyên x biết
2x+12=3(x-7)
\(2x+12=3\left(x-7\right)\)
\(2x+12=3x-21\)
\(2x-3x=-21-12\)
\(-x=-33\)
\(x=33\)
\(\Leftrightarrow2x+12=3x-21.\)
\(\Leftrightarrow2x-3x=-21-12\)
\(\Leftrightarrow-x=-33\)
\(\Rightarrow x=33\)
Vậy \(x=33\)