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a, X x 9,9 + X : 10 = 12,5
X x 9,9 + X x 0,1 = 12,5
X x (9,9 + 0,1) = 12,5
X x 10 = 12,5
X = 12,5 : 10 = 1,25
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X + X : 2 + X : 4 + X : 8 = 37,725
X : (1 + 2 + 4 + 8) = 37,725
X : 15 = 37,725
X = 37,725 x 15 = 565,875
a; \(x\) \(\times\) 9,9 + \(x\) : 10 = 12,5
\(x\) \(\times\) 9,9 + \(x\) \(\times\) 0,1 = 12,5
\(x\) \(\times\) (9,9 + 0,1) = 12,5
\(x\) \(\times\) 10 = 12,5
\(x\) = 12,5 : 10
\(x\) = 1,25
b; \(x\) + \(x\) : 2 + \(x\) : 4 + \(x\) : 8 = 37,725
\(x\) \(\times\) 1 + \(x\) \(\times\) \(\dfrac{1}{2}\) + \(x\) \(\times\) \(\dfrac{1}{4}\) + \(x\) \(\times\) \(\dfrac{1}{8}\)= 37,725
\(x\) \(\times\)(1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\)) = 37,725
\(x\) \(\times\) \(\dfrac{15}{8}\) = 37,725
\(x\) = 37,725 : \(\dfrac{15}{8}\)
\(x\) = 20,12
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 9,9 + X : 10 = 20,06
X x 9,9 + X x 1/10 = 20,06
X x 9,9 + X x 0,1 = 20,06
X x ( 9,9 + 0,1 ) = 20,06
X x 10 = 20,06
X = 20,06 : 10
X = 2,006
X x9,9 +X x 0,1=20,06
X x (9,9+0,1)=20,06
X x 10=20,06
X=20,06:10
X=2,006
**** mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 9,9 + X : 10 = 20,06
Xx 9,9 + X x 1/10 20,06
Xx 9,9 + X 0,1 = 20,06
X x 10 = 20 ,06
X= 20,06 x 10
X =2,006
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\cdot9,9+x:10=12,5\)
\(x\cdot9,9+x\cdot\frac{1}{10}=12,5\)
\(x\cdot\left(9,9+\frac{1}{10}\right)=12,5\)
\(x\cdot\left(\frac{99}{10}+\frac{1}{10}\right)=12,5\)
\(x\cdot\frac{100}{10}=12,5\)
\(x\cdot10=12,5\)
\(x=12,5:10\)
\(x=1,25\)
Vậy x = 1,25
![](https://rs.olm.vn/images/avt/0.png?1311)
x:10+x*9,9=23,6
x*1/10+x*9,9 =23,6
x*(1/10+9,9)=23,6
x*10=23,6
x=23,6/10
x=2,36