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30% x y + y = 52
0,3 x y x y = 52
0,3 x y + y x 1 = 52
y x ( 1 + 0,3 ) = 52
y x 1,3 = 52
y = 52 : 1,3
y = 40
30 % x y + y = 52
0,3 x y + y = 52
0,3 x y + y x 1 = 52
y x ( 1 + 0,3 ) = 52
y x 1,3 = 52
y = 52 : 1,3
y = 40
![](https://rs.olm.vn/images/avt/0.png?1311)
\(30\cdot y+y=52\)
\(30\cdot y+y\cdot1=52\)
\(y\cdot\left(30+1\right)=52\)
\(y\cdot31=52\)
\(y=\frac{52}{31}\)
\(tích\)\(nha\)
![](https://rs.olm.vn/images/avt/0.png?1311)
30% x y + y = 52
<=> 0,3 x y + y x 1 = 52
=> (0,3 + 1) x y = 52
1,3 x y = 52
y = 52 : 1,3
y = 40
Vậy y = 40
![](https://rs.olm.vn/images/avt/0.png?1311)
30% * y + y=52
\(\frac{3}{10}\)* y+y=52
y*( \(\frac{3}{10}\)+1)=52
y*\(\frac{13}{10}\)=52
y=52:\(\frac{13}{10}\)
y=???(tự tính nha!!!!!!!!)
![](https://rs.olm.vn/images/avt/0.png?1311)
30% x y + y = 52
3/10 x y + y = 52
13/10 x y = 52
y = 52 : 13/10
y = 40
![](https://rs.olm.vn/images/avt/0.png?1311)
\(30\%\cdot y+y=52\)
\(\frac{3}{10}\cdot y+y=52\)
\(y\cdot\left(\frac{3}{10}+1\right)=52\)
\(y\cdot\frac{13}{10}=52\)
\(y=52:\frac{13}{10}\)
\(y=40\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
30%= 0,3
0,3 x y + y = 52
0,3 x y + y x 1 = 52
y x ( 0,3 + 1) = 52
y x 1,3 = 52
y= 52 : 1,3
y= 40
y x ( 30% + 1 ) = 52
y x 13/10 = 52
=> y = 52 : 13/10
=> y = 40