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17x + 3. ( -16x – 37) = 2x + 43 - 4x
<=>17x-48x-111=-2x+43
<=>-29x=154
<=> \(x=-\frac{154}{29}\)
-3. (2x + 5) -16 < -4. (3 – 2x)
\(\Leftrightarrow-6x-31< -12+8x.\)
\(\Leftrightarrow-14x< 19\Rightarrow x< -\frac{19}{14}\)
|Câu d:
x = 3/4 + 1/-12
x = 9/12 - 1/12
x = 8/12
x = 2/3
Vậy x = 2/3
Câu e:
x /14 = 1/7 + (-3)/14
x/14 = 1/7 - 3/14
x/14 = 2/14 - 3/14
x/14 = -1/14
x = - 1/14 x 14
x = -1
Vậy x = -1
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
1) x - 2 = -6
x = -6 + 2
x = -4
2) -5 . x - ( -3 ) =13
-5 . x = 13 + ( -3 )
-5 . x = 10
x = 10 : ( -5 )
x = -2
1) 10 - 3 ( x - 1 ) = -5
3 ( x - 1 ) = 10 - ( - 5 )
3 ( x - 1 ) = 15
x - 1 = 15 : 3
x - 1 = 5
x = 5 + 1
x = 6
2) 3x + 75 = - 15
3x = - 15 - 75
3x = - 90
x = -90 : 3
x = -30
4) 12 - ( x - 7 ) = - 8
x - 7 = 12 - (- 8 )
x - 7 = 20
x = 20 + 7
x = 27
5) x + 75 = 15
x = 15 - 75
x = -60
7) 2x + 18 = 10
2x = 10 - 18
2x = -8
x = - 8 : 2
x = -4
8) 26 - 3x = 5
3x = 26 - 5
3x = 21
x = 21: 3
x = 7
9) x - 12 = - 15
x = -15 + 12
x =-3
10 ) 24 - 2 ( x + 5 ) = 38
2 ( x+ 5 ) = 24 - 38
2 ( x + 5 ) = - 14
x + 5 = -14 : 2
x + 5 = -7
x = -7 - 5
x = -12
còn là bạn tự làm tiếp nhé ! bạn gửi nhiều cầu qua bạn chỉ nên gửi ít một thời như vậy khó có thể giải làm bạn ạ!
\(\left|x\right|-3+6=16\\ \left|x\right|=13\Rightarrow x=\pm13\)
\(35-\left|2x-1\right|=14\\ \left|2x-1\right|=21\\ \left(2x-1\right)^2=21^2\\ \left(2x-1+21\right)\left(2x-1-21\right)=0\\ 4\left(x+10\right)\left(x-11\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=-10\\x=11\end{matrix}\right.\)
\(\left|3x-2\right|+5=9-x\\ \left|3x-2\right|=4-x\\ \Rightarrow\left(3x-2\right)^2=\left(4-x\right)^2\\ \left(3x-2-4+x\right)\left(3x-2+4-x\right)=0\\ 4\left(2x-3\right)\left(x+1\right)=0\\ \Rightarrow\left[{}\begin{matrix}2x-3=0\\x+1=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=-1\end{matrix}\right.\)
\(x-\left(-25+7\right)>12-\left(15-14\right)\\ x+18>11\\ x>-7\)
\(\left|17+\left(x-15\right)\right|< 5\\ \left|x+2\right|< 5\\ \Rightarrow-5< x+2< 5\\ -7< x< 3\)
1) \(\left|x\right|-3+6=16\)
\(\left|x\right|-3=16-6\)
\(\left|x\right|-3=10\)
\(\left|x\right|=13\) \(\rightarrow\) \(x=\pm13\)
2) \(35-\left|2x-1\right|=14\)
\(\left|2x-1\right|=21\)
\(\left(2x-1\right)^2=21^2\)
\(\left(2x-1+21\right)\left(2x-1-21\right)=0\)
\(4\left(x+10\right)\left(x-11\right)=0\)
\(\Rightarrow\) \(\left[{}\begin{matrix}x=-10\\x=11\end{matrix}\right.\)
3) \(\left|3x-2\right|+5=9-x\)
\(\left|3x-2\right|=4-x\)
\(\Rightarrow\left(3x-2\right)^2=\left(4-x\right)^2\)
\(\left(3x-2-4+x\right)\left(3x-2+4-x\right)=0\)
\(4\left(2x-3\right)\left(x+1\right)=0\)
\(\Rightarrow\) \(\left[{}\begin{matrix}2x-3=0\\x+1=0\end{matrix}\right.\) \(\Rightarrow\) \(\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=-1\end{matrix}\right.\)
4) \(x-\left(-25+7\right)>12-\left(15-14\right)\)
\(\Leftrightarrow x+18>11\)
\(x>-7\)
5) \(\left|17+\left(x-15\right)\right|< 5\)
\(\Leftrightarrow\) \(\left|x+2\right|< 5\)
\(-5< x+2< 5\)
\(\Rightarrow\) \(-7< x< 3\)