y+y:3*4,5+y:2*7=252
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câu 1: 3,2
câu 2: 40
câu 3: 12
câu 4: 42
nhớ cho mình nhé !
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=>y+y x 1/3x9/2+yx7/2=252
=>y+yx3/2+yx7/2=252
=>y x (3/2+7/2+1)=252
=> y x 6=252
=> y = 252:6=42
![](https://rs.olm.vn/images/avt/0.png?1311)
y + y x1/3 : 2/9 + y : 2/7 = 252
y x 1 + y x ( 1/3 x 9/2 ) + y x 7/2 =252
y x1/1 + y x 3/2 + y x 7/2 =252
y x ( 1/1 + 3/2 + 7/2 ) =252
y x ( 2/2 + 3/2 + 7/2 ) =252
y x 6 = 252
y = 252 : 6
y = 42
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y+y.\frac{1}{3}:\frac{2}{9}+y:\frac{2}{7}=252\)
=>\(y.\frac{2}{2}+y.\frac{3}{2}+y.\frac{7}{2}=252\)
=>\(y.\left(\frac{2}{2}+\frac{3}{2}+\frac{7}{2}\right)=252\)
=>\(y.6=252\)
=>y=252:6
=>y=42
![](https://rs.olm.vn/images/avt/0.png?1311)
y + y.1/3 : 2/9+y:2/7=252
=> y + y.1/3.9/2 + y.7/2=252
=> y + 2y + y(7/2)=252
=>y(1+2+7/2)=252
=>y.13/2=252
=>y=252.2/13=
=>Y+Y.1/3.9/2+Y.7/2=252
=>Y+3/2.Y+7/2.Y=252
=>Y(1+3/2+7/2)=252
=>Y.(2/2+3/2+7/2)=252
=>6Y=252
=>Y=4
VẬY Y=42
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
sau các phép tính đó thì tổng bao nhiêu vậy bạn ? hình như đề hơi sai