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![](https://rs.olm.vn/images/avt/0.png?1311)
Đổi 30% = 3/10
Ta có: 3/10 x y + y = 52
y x (3/10 + 1) = 52
y x 13/10 = 52
y = 52 : 13/10
y = 40
![](https://rs.olm.vn/images/avt/0.png?1311)
30% x y + y = 52
3/10 x y + y = 52
( 3/10 + 1 ) x y = 52
13/10 x y = 52
y = 52 : 13/10
y = 40
30% x y + y = 52
3/10 x y + y = 52
( 3/10 + 1 ) x y = 52
13/10 x y = 52
y = 52 : 13/10
y = 40
![](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)
![](https://rs.olm.vn/images/avt/0.png?1311)
30% x y + y = 52
=> 3/10 x y + 1 x y = 52
=> y x (3/10 + 1) = 52
=> y x 13/10 = 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% 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
30% x Y+Y=52
\(\frac{3}{10}\) x Y+Y=52
(\(\frac{3}{10}\)+1) x Y=52
\(\frac{13}{10}\) x Y=52
Y=52:\(\frac{13}{10}\)
Y=40
30 % x Yx2=52
30 %x Y= 54:2
30% xY= 27
Y = 27:30%
Y =90