22 x X + X x 27 + X = 25
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22 x X + X x 27 + X = 25
22 x X + X x 27 + X x 1 = 25
X x ( 22 + 27 +1 ) = 25
X x 50 = 25
X = 25 : 50
X = \(\dfrac{1}{2}\) = 0,5
22 x X + X x 27 + X = 25
22 x X + X x 27 + X x 1 = 25
X x (22 + 27 + 1) = 25
X x 50 = 25
X = 25 : 50
X = 0,2
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`22 \times x + 27 \times x + x = 25`
`x \times (22 + 27 + 1) = 25`
`x \times 50 = 25`
`x = 25 \div 50`
`x =`\(\dfrac{25}{50}=\dfrac{1}{2}\)
Vậy, \(x=\dfrac{1}{2}\)
\(22xX+27xX+X=25\\ \left(22+27+1\right)xX=25\\ 50xX=25\\ x=50:25=2.\)
Vậy \(X=2.\)
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x + 20 + 21 + x + 22 + 23 + x + 24 + 25 + x + 26 + 27 + x + 28 + 29 + x + 30 = 330
6x + (30 + 20) . (30 - 20 + 1) : 2 = 330
6x + 50 . 11 : 2 = 330
6x + 275 = 330
6x = 330 - 275
6x = 55
x = 55 : 6
x = 55/6
\(x+20+21+x+22+23+x+24+25+x+26+27+x+28+29+x+30=330\)
\(\Rightarrow\left(x+x+x+x+x+x\right)+\left(20+21+22+23+24+25+26+27+28+29+30\right)=330\)
\(\Rightarrow6x+\left[\left(30-20\right):1+1\right]\left(20+30\right):2=330\)
\(\Rightarrow6x+11.50:2=330\)
\(\Rightarrow6x+275=330\)
\(\Rightarrow6x=55\)
\(\Rightarrow x=\dfrac{55}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 20 + 21 + x + 22 + 23 + x + 24 + 25 + x + 26 + 27 + x + 28 + 29 + x + 30 = 330
6x + (30 + 20) . (30 - 20 + 1) : 2 = 330
6x + 50 . 11 : 2 = 330
6x + 275 = 330
6x = 330 - 275
6x = 55
x = 55 : 6
x = 55/6
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 22 + (2x -13) = 83 => 2x -13 = 61 => x = 37.
b) 51 - (-12 + 3x) = 27 => 63 - 3x = 27 => x = 12.
c) - (2x + 2) + 21 = - 23 => 2x + 2 = 44 => x = 21.
d) 25 - (25 - x) = 0 => 25 - 25 + x = 0 => x = 0.
\(x\times\left(22+27+1\right)=25\)
\(50x=25\)
\(x=\dfrac{25}{50}=\dfrac{1}{2}\)
\(=>x=\dfrac{25}{22+27+1}=\dfrac{25}{50}=\dfrac{1}{2}\)