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X + X * 2 + X * 3 = 1,23
=>x*(1+2+3)=1,23
=>x*6=1,23
=>x=1,23:6
=>x=0,205
![](https://rs.olm.vn/images/avt/0.png?1311)
X + X x 2 + X x 3 = 1,23
X x 1 + X x 2 + X x 3 = 1,23
X x ( 1 + 2 + 3 ) = 1,23
X x 6 = 1,23
X = 1,23 : 6
X = 0,205
bạn tk mik nha
X + X x 2 + X x 3 = 1,23
X x ( 1 + 2 + 3 ) = 1,23
X x 6 = 1,23
X = 1,23 : 6
X = 0,25
Chúc bạn may mắn
![](https://rs.olm.vn/images/avt/0.png?1311)
1,23 :100 +1,23 x 0,09 +1,23 x0,9
= 1,23 x 0,01 + 1,23 x 0,09 + 1,23 x 0,9
=1,23 x ( 0,01 + 0,09 + 0,9)
=1,23 x 1
=1,23
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 1,23 * x -1,02 * x = 4,2
\(\Rightarrow x\cdot\left(1,23-1,02\right)=4,2\Rightarrow0,21\cdot x=4,2\Rightarrow x=\frac{420}{100}\div\frac{21}{100}=20\)
b, 11,95-x/2,5=7,35
\(\Rightarrow x\div\frac{25}{10}=11,95-7,35=4,6\Rightarrow x\div\frac{5}{2}=4,6\Rightarrow x=4,6\cdot\frac{5}{2}=\frac{46}{10}\cdot\frac{5}{2}=\frac{23}{5}\cdot\frac{5}{2}=\frac{23}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1,23:x-0,45:x=1,5\)
\(\Leftrightarrow\left(1,23-0,45\right):x=1,5\)
\(\Leftrightarrow0,78:x=1,5\)
\(\Leftrightarrow x=0,52\)
Vậy \(x=0,52\)
![](https://rs.olm.vn/images/avt/0.png?1311)
dấu "." là dấu "x" nhé![](blob:https://chat.zalo.me/5fb2ed9f-0106-4745-8298-9d08e880b37c)