Tìm x
3x+17=12
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\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\Rightarrow x\cdot\left(\frac{3}{6}-\frac{4}{6}\right)=\frac{7}{12}\)
\(\Rightarrow x\cdot\left(-1\right)=\frac{7}{12}\Rightarrow x=\frac{7}{12}:\left(-1\right)=\frac{7}{-12}\)
\(c,\frac{\left(x-5\right)}{12}\cdot\frac{9}{29}=\frac{-6}{29}\Rightarrow\frac{\left(x-5\right)}{12}=\frac{-6}{29}:\frac{9}{26}\)
\(\frac{\Rightarrow\left(x-5\right)}{12}=\frac{-6}{9}=\frac{-2}{3}\Rightarrow x-5=-\frac{2}{3}\cdot12\)
\(\Rightarrow x-5=\frac{-24}{3}=-8\Rightarrow x=-8+5=-3\)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow-\frac{1}{6}x=\frac{7}{12}\)
\(\Rightarrow x=-\frac{7}{2}\)
\(c,\frac{x-5}{12}\cdot\frac{9}{29}=-\frac{6}{29}\)
\(\Rightarrow\frac{x-5}{12}=-\frac{2}{3}\)
\(\Rightarrow x-5=12.\left(-\frac{2}{3}\right)\)
\(\Rightarrow x-5=-8\)
\(\Rightarrow x=-3\)
| 3x+1|-17=-12
| 3x+1|=-12+17
|3x+1|=5
=>3x+1 thuộc {5;-5}
=>3x thuộc {4;-6}
Do 3x chia hết cho 3 nên 3x=-6
x=-6:3=-2
Vậy x=-2
(x−3)(x2+3x+9)−(3x−17)=x3−12(x−3)(x2+3x+9)−(3x−17)=x3−12
⇔x3−27−3x+17−x3+12=0⇔x3−27−3x+17−x3+12=0
⇔2−3x=0⇔2−3x=0
⇔3x=2⇒x=23
3x + 17 = 12
=> 3x = 12 - 17
=> 3x = -5
=> x = \(\frac{-5}{3}\)
a, ( 4x - 13 ) - (3x + 17) = -19 - (-12)
=> 4x - 13 - 3x - 17 = -19 + 12
=> x = -19 + 12 + 13 + 17 = 23
( 4x - 13 ) - (3x + 17) = -19 - (-12)
4x - 13- 3x - 17= -7
(4x-3x)-13=-7
x-13=-7
x=-7 +13
x=6
Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
7+x=-16
x=-16-7
x=-23
2) 2x – 35 = 15
2x=15+35
2x=50
x=50:2
x=25
3) 3x + 17 = 12
3x=12-17
3x=-5
x=-5/3
4) (2x – 5) + 17 = 6
2x-5=6-17
2x-5=-11
2x=-11+5
2x=-6
x=-6:2
x=-3
5) 10 – 2(4 – 3x) = -4
2(4-3x)=10-(-4)
2(4-3x)=14
4-3x=14:2
4-3x=7
3x=4-7
3x=-3
x=-3:3
x=-1
6) - 12 + 3(-x + 7) = -18
3(-x+7)=-18-(-12)
3(x+7)=-6
x+7=-6:3
x+7=-2
x=-2-7
x=-9
a: 12:x=144
=>\(x=\dfrac{12}{144}\)
=>\(x=\dfrac{1}{12}\)
b: \(x-17=\left(-2\right)\cdot27\)
=>\(x-17=-54\)
=>\(x=-54+17=-37\)
c: \(3x-125=145\)
=>\(3x=125+145=270\)
=>\(x=\dfrac{270}{3}=90\)
\(a,12:x=144\\ x=\dfrac{12}{144}=\dfrac{1}{12}\\ ---\\ b,x-17=\left(-2\right).27\\ x-17=-54\\ x=-54+17=-37\\ ----\\ 3x-125=145\\ 3x=145+125=270\\ x=\dfrac{270}{3}=90\)
=> 3x = 12 - 17 = -5
=> x = -5 : 3 = -5/3
Vậy x = -5/3
Tk mk nha
( 3x + 4 ) : 12 + 17 = 19
( 3x + 4 ) : 12 = 19 - 17
( 3x + 4 ) : 12 = 2
3x + 4 = 2.12
3x + 4 = 24
3x = 24 - 4
3x = 20
x = 20 : 3
x = 6,66...
Đáp số : 6,66...
\(\text{3x+17=12}\)
\(3x=12-17\)
\(3x=-5\)
\(\Rightarrow x=\frac{-5}{3}\)
học tốt
Ta có : 3x+17=12
=) 3x = 12 - 17 = -5
=) x = \(\frac{-5}{3}\)
đăng kí kênh của V-I-S nha !