Tìm số nguyên x biết
a)(x+153)-(48-193)=1-2-3-4
b)8x-75=5x+21
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a, 4x -15=-75-x b,72-3x= 5x+8
4x+x=-75+15 -3x-5x=8-72
5x=-60 -8x=-64
x=-60:5 8x=64
x=-14 x=64:8
x=8
c,3Ix-7I=21 d,-7Ix+3I=-49
Ix-7I=21:3 Ix+3I=-49:-7
Ix-7I=7 Ix+3I=7
x-7=7 hoặc x-7=-7 x+3=7 hoặc x+3=-7
x=14 hoặc x=0 x=4 hoặc x=-10
34+(21-x)=(3747-30)-3746
34+(21-x)=3717-3746
34+(21-x)=-29
21-x=-29-34
21-x=-63
x=21-(-63)
x=21+63
x=84
(x+153)-(48-193)=1-2-3-4
(x+153)-(48-193)=-8
(x+153)-(-145)=-8
(x+153)+145=-8
x+153=-8-145
x+153=-153
x=-153-153
x=0
35-(x+5)=315-(2x+135)
213-(x+84)= -161
x+84=213-(-161)
x+84=213+161
x+84=374
x=374-84
x=290
\(a,\text{Với }x< -2\Rightarrow3-x-x-2=4\\ \Rightarrow-2x=3\Rightarrow x=-\dfrac{3}{2}\left(ktm\right)\\ \text{Với }-2\le x< 3\Rightarrow3-x+x+2=4\\ \Rightarrow0x=-1\Rightarrow x\in\varnothing\\ \text{Với }x\ge3\Rightarrow x-3+x+2=4\\ \Rightarrow2x=5\Rightarrow x=\dfrac{5}{2}\left(ktm\right)\)
Vậy \(x\in\varnothing\)
\(b,\text{Với }x< 2\Rightarrow4-2x+18-6x=21\\ \Rightarrow22-8x=21\Rightarrow x=\dfrac{1}{8}\left(tm\right)\\ \text{Với }2\le x< 3\Rightarrow2x-4+18-6x=21\\ \Rightarrow-4x+14=21\Rightarrow x=-\dfrac{7}{4}\left(ktm\right)\\ \text{Với }x\ge3\Rightarrow2x-4+6x-18=21\\ \Rightarrow8x=43\Rightarrow x=\dfrac{43}{8}\left(tm\right)\)
Vậy \(x\in\left\{\dfrac{1}{8};\dfrac{43}{8}\right\}\)
\(\text{(x+153)-(48-193)=1-2-3-4}\)
\(\left(x+153\right)+145=-8\)
\(x+153=-8-145\)
\(x+153=-153\)
\(x=-153-153\)
\(x=-306\)
học tốt
(x+153)-(48-193)=1-2-3-4
(x+153)+145=-8
x+153=-8-145
x+135=-153
x=-153-135
x=-288
Vậy x=-288
a: \(\left|3x-2\right|=4\)
\(\Leftrightarrow\left[{}\begin{matrix}3x-2=4\\3x-2=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-\dfrac{2}{3}\end{matrix}\right.\)
b: Ta có: \(\left|5x-3\right|=\left|x-7\right|\)
\(\Leftrightarrow\left[{}\begin{matrix}5x-3=x-7\\5x-3=7-x\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}4x=-4\\6x=10\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-1\\x=\dfrac{5}{3}\end{matrix}\right.\)
A,(X+153)-(48+193)=1-2-3-4:
x+153-48-193=1-2-3-4
x+(-88)=-8
x-88=-8
x=-8+88=80
\(x-153-48+193=2x+193-12-153\)
\(x-48=2x-12\)
\(x=-36\)
1. ta có |x+8|=6
=> x+8=6 hoặc x+8=-6
+ x+8=6
=> x=-2
+ x+8=-6
=> x= -14
Vậy x={-14;-2}
2. ta có 1<|x-2|<4
=> x-2={-2;2;-3;3}
=>
x-2 | 2 | -2 | 3 | -3 |
x | 4 | 0 | 5 | -1 |
=> x={-1;0;4;5}
4. A= -2017+(-21+75+2017)
A= -2017-21+75+2017
A=(-2017+2017)+(-21+75)
A=54
B=......?
3. (X+153)-(48-193)=1-2-3-4
(x+153)+145=-8
x+153=-8-145
x+153=-153
x=-306