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a,x-25=-43 b,35-5(x+13)=-15 c,5x+6=-19 d,51-(-12+3x)=27 e,3x+4=-23
x=(-43)+25 5(x+13)=35-(-15) 5x=-19-6 -12+3x=51-27 3x=(-23)-4
x=-18 5(x+13)=35+15 5x=(-19)+(-6) -12+3x=24 3x=(-23)+(-4)
5(x+13)=50 5x=-25 3x=24-(-12) 3x=-27
x+13=50:5 x=(-25):5=-5 3x=24+12 x=-27:3=-9
x+13=10 3x=36
x=13-10 x=36:3=12
x=3
NHỚ K CHO MÌNH NHA!!!!!!!
a.x - 25 = -43
x = -43 + 25
x = -18
b.35 - 5(x + 13) = -15
5(x + 13) = 35 - (-15)
5(x + 13) = 50
x + 13 = 50 : 5
x + 13 = 10
x = 10 - 13
x = -3
c. 5x + 6 = -19
5x = -19 - 6
5x = -25
x = -25 : 5
x = -5
d.51 - (-12 + 3x) = 27
-12 + 3x = 51 - 27
-12 + 3x = 24
3x = 24 - (-12)
3x = 36
x = 36 :3
x = 12
e. 3x +4 = -23
3x = -23 - 4
3x = -27
x = -27 : 3
x = -9
a) \(55-4x-4\left(-x+3\right)=6-2\left(-8-3x\right)\)
\(55-4x+4x-12=6+16+6x\)
\(43-6-16=6x\)
\(6x=21\)
\(x=3,5\)
b) \(-5\left(-2x-6\right)-9\left(4-7x\right)=51-3x+6\left(x-9\right)\)
\(10x+30-36+63x=51-3x+6x-54\)
\(73x-6=-3+3x\)
\(73x-3x=-3+6\)
\(70x=3\)
\(x=\frac{3}{70}\)
c) \(93+\left|6-3x\right|-39=231\)
\(\left|6-3x\right|+54=231\)
\(\left|6-3x\right|=177\)
\(\Rightarrow\orbr{\begin{cases}6-3x=177\\6-3x=-177\end{cases}}\Rightarrow\orbr{\begin{cases}3x=6-177\\3x=6+177\end{cases}}\Rightarrow\orbr{\begin{cases}3x=-171\\3x=183\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-57\\x=61\end{cases}}\)
a) \(5x-65=5.3^2 \\ 5x-65=45\\5x=45+65\\5x=110\\x=22\)
b) \(200-(2x+6)=4^3\\2x+6=200-4^3\\2x+6=136\\2x=130\\x=65\)
c) \(2(x-51)=2.2^3+20\\2(x-51)=16+20\\2(x-51)=36\\x-51=18\\x=51+18=69\)
d) \(135-5(x+4)=35\\5(x+4)=135-45\\5(x-4)=90\\x-4=18\\x=18+4=22\)
e) \((2x-4)(15-3x)=0\\2(x-2).3(5-x)=0\\(x-2)(5-x)=0\\ \left[ \begin{array}{l}x-2=0\\5-x=0\end{array} \right. \\ \left[ \begin{array}{l}x=2\\x=5\end{array} \right.\)
f) \(2^{x+1} . 2^{2014}=2^{2016} \\ (2^{x+1} . 2^{2014}):2^{2014}=2^{2016} :2^{2014} \\ 2^{x=1}=2^{2016-2014} \\2^{x+1}=2^2\\x+1=2\\x=1\)
g) \(15+(x-1)^3=43\\(x-1)^3=15-42\\(x-1)^3=-27\\(x-1)^3=(-3)^3\\x-1=-3\\x=-2\)
h) \(15-x=17+(-9)\\15-x=17-9\\15-x=8\\x=15-8\\x=7\)
i) \(|x-5|=|-7|+|-4|\\|x-5|=7+4\\|x-5|=11\\ \left[ \begin{array}{l}x-5=11\\x-5=-11\end{array} \right. \\ \left[ \begin{array}{l}x=16\\x=-6\end{array} \right.\)
k) \(|x-3|-12=-9+|-7|\\|x-3|-12=-9+7\\|x-3|-12=-2\\|x-3|=10 \\ \left[ \begin{array}{l}x-3=10\\x-3=-10\end{array} \right. \\ \left[ \begin{array}{l}x=13\\x=-7\end{array} \right.\)
\(a,x-\frac{3}{4}=\frac{1}{7}\)
\(x=\frac{1}{7}+\frac{3}{4}=\frac{25}{28}\)
\(b,\frac{15}{x}-\frac{1}{3}=\frac{28}{51}\)
\(\frac{15}{x}=\frac{28}{51}-\frac{1}{3}=\frac{15}{17}\)
\(\Rightarrow x=17\)
học tốt ~~~
\(x-\frac{3}{4}=\frac{1}{7}\)
\(x\) \(=\frac{1}{7}+\frac{3}{4}\)
\(x\) \(=\frac{4}{28}+\frac{21}{28}\)
\(x\) \(=\frac{4+21}{28}\)
\(x\) \(=\frac{25}{28}\)
1/ 3(x - 2) = 9 => x - 2 = 3 => x = 5
2/ 3(x - 36) = 216 => x - 36 = 72 => x = 108
3/ (x - 3)3 = 33 => x - 3 = 3 => x = 6
4/ 2x = 32 => 2x = 25 => x = 5
5/ 3x - 16 = 2.74 : 73 = 14 => 3x = 30 => x = 10
6/ (6x - 39) : 3 = 201 => 6x - 39 = 603 => 6x = 642 => x = 107
7/ (3x - 15)2 = 81 => (3x - 15)2 = 92 => 3x - 15 = 9 => 3x = 24 => x = 8
8/ 3(x + 4) = 105 => x + 4 = 35 => x = 31
9/ 12x - 43 = 4.84 : 83 = 32 => 12x = 32 : 64 => 12x = 1/2 => x = 1/24
10/ 41 - (2x - 5) = 680 => 2x - 5 = -639 => 2x = -634 => x = - 317
1) 14x-8x=10+5
x(14-8)=15
x6=15
x=15/6
2)5x-3x=30-15
2x=15
x=15/2
3)làm tương tự
1. Tìm x
a, x + 15 = 4
x = 4 - 15
x = - 11
Vậy x = - 11
b, - 3 x = - 51
x = - 51 : ( - 3 )
x = 17
Vậy x = 17