[2x+3]^2=25
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tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
Toán lớp 6Tìm x
Trả lời Câu hỏi tương tự
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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)
\(\Leftrightarrow-6x-31< -12+8x.\)
\(\Leftrightarrow-14x< 19\Rightarrow x< -\frac{19}{14}\)
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\(\dfrac{3}{2x+10}+\dfrac{3}{x-5}-\dfrac{2x}{x^2-25}\)
\(=\dfrac{3\left(x-5\right)}{2\left(x+5\right)\left(x-5\right)}+\dfrac{6\left(x+5\right)}{2\left(x+5\right)\left(x-5\right)}-\dfrac{4x}{2\left(x+5\right)\left(x-5\right)}\)
\(=\dfrac{3x-15+6x+30-4x}{2\left(x+5\right)\left(x-5\right)}\)
\(=\dfrac{5x+15}{2\left(x+5\right)\left(x-5\right)}\)
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\(-2x-\left(x-17\right)=34-\left(-x+25\right)\)
\(-2x-x+17=34+x-25\)
\(-2x-x-x=34-25-17\)
\(-4x=-8\Leftrightarrow x=2\)
\(17x-\left(16x-37\right)=2x+43\)
\(17x-16x+37=2x+43\)
\(17x-16x-2x=-37+43\)
\(-x=6\Leftrightarrow x=6\)
\(-2x-3\left(x+17\right)=34-2\left(-x+25\right)\)
\(-2x-3x-51=34+2x-50\)
\(-2x-3x-2x=34-50+51\)
\(-7x=35\Leftrightarrow x=-5\)
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a) x(2x - 1) - (x - 2)(2x + 3) = 5
2x2 - x - 2x2 - 3x + 4x + 6 = 5
0x = -1 (vô lý)
Vậy không tìm được x
b) (x - 3)2 - 25 = 0
(x - 3)2 - 52 = 0
(x - 3 - 5)(x - 3 + 5) = 0
(x - 8)(x + 2) = 0
\(\Rightarrow\) x - 8 = 0 hoặc x + 2 = 0
*) x - 8 = 0
x = 0 + 8
x = 8
*) x + 2 = 0
x = 0 - 2
x = -2
Vậy x = 8; x = -2
c) (x - 1)(2 - x) + (x + 3)2 = 4 - 2x
2x - x2 - 2 + x + x2 + 6x + 9 = 4 - 2x
9x + 7 = 4 - 2x
9x + 2x = 4 - 7
11x = -3
x = \(\dfrac{-3}{11}\)
Vậy x = \(\dfrac{-3}{11}\)
\(\Leftrightarrow\left(2x+3\right)^2=5^2\Rightarrow2x+3=\pm5\)
+ Với \(2x+3=5\Rightarrow x=1\)
+ Với \(2x+3=-5\Rightarrow x=-4\)