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\(2x-\frac{3}{5x}=\frac{21}{25}\)
\(\Rightarrow\frac{x}{2}-\frac{5x}{3}=\frac{25}{21}\)
\(\Leftrightarrow\frac{21x}{42}-\frac{70x}{42}=\frac{50}{42}\)
\(\Rightarrow21x-70x=50\)
\(\left(21-70\right)x=50\)
\(\Leftrightarrow-49x=50\)
\(\Leftrightarrow x=-\frac{49}{50}\)
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a, 117 - \(x\) = 28 - (-7)
117 - \(x\) = 28 + 7
117 - \(x\) = 35
\(x\) = 117 - 35
\(x\) = 82
b, \(x\) - (-38 - 2\(x\)) = (-3) - 8 + 2\(x\)
\(x\) + 38 + 2\(x\) = - 11 + 2\(x\)
3\(x\) + 38 = - 11 + 2\(x\)
3\(x\) - 2\(x\) = - 11 - 38
\(x\) = - 49
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\(a,8x-75=5x+21\)
\(8x-5x=21+75\)
\(3x=96\)
\(x=32\)
\(b,9x+25=-\left(2x-58\right)\)
\(9x+25=-2x+58\)
\(9x+2x=58-25\)
\(11x=33\)
\(x=3\)
\(c,\left(5-x\right).\left(x+2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}5-x=0\\x+2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-2\end{cases}}}\)
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a) 8x-75=5x+21
8x-5x=21+75
3x=96:3
x=32
b) 9x+25=-(2x-58)
9x+25=-2x+58
9x+2x=58-25
11x=33
x=33:11
x=3
tick mình nha
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Mình không viết lại đề nhé!
a) 27 - x + 15 + x = x + 2
-x + x - x = 2 - 15 - 27
-x = -40
x = 40
b) 8x - 75 = 5x +21
8x - 5x = 21 + 75
3x = 96
x = 32
c) 15 - |2x - 1| = |-8|
15 - 2x + 1 = 8
-2x = 8 -1 -15
-2x = -8
x = 4
d) 9x + 25 = -(2x - 58)
9x + 25 = -2x + 58
9x +2x = 58 - 25
7x = 33
x = 33/7
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1) 5x + 3 = 2(x + 7)
5x + 3 = 2x + 2.7
5x + 3 = 2x + 14
5x - 2x = 14 - 3
3x = 11
x = 11/3
Vậy x = 11/3
2) 5x - 25 = 2x - 3
5x - 2x = -3 + 25
3x = 22
x = 22/3
Vậy x = 22/3
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a: =>x+38+2x=-3-8+2x
=>3x+38=2x-11
=>x=-49
b: \(\Leftrightarrow65+x-15-5x=12-5x\)
=>-4x+50=-5x+12
=>x=-38
c: \(\Leftrightarrow3x+12-7x+21=-3-5x-2=-5x-5\)
=>-4x+33=-5x-5
=>x=-38
d: \(\Leftrightarrow-123+2x+23=x-120\)
=>2x-100=x-120
=>x=-20
e: =>-45+25+5x=16-x
=>5x-20=-x+16
=>6x=36
=>x=6
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a) 5x - 7 + 2x = 21
5x + 2x - 7 = 21
7x - 7 = 21
7x = 21 + 7
7x = 28
x = 28:7
x = 4
b) 4x-3 = 2x+5
=> 4x - 2x = 5+3
2x = 8
x = 8:2
x = 4
\(a,5x-7+2x=21\)
\(\Rightarrow\left(5x+2x\right)-7=21\)
\(\Rightarrow7x-7=21\)
\(\Rightarrow7x=21+7\)
\(\Rightarrow7x=28\)
\(\Rightarrow x=28\div7\)
\(\Rightarrow x=4\)
\(b,4x-3=2x+5\)
\(\Rightarrow4x-2x=5+3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=8\div2\)
\(\Rightarrow x=4\)