y:2+y:3+y:5=30
<=>y:(2+3+5)=30
<=>y:10=30
=>y=30x10
=>y=300
y:2+y:3+y:5=30
y:(2+3+5)=30
y:10=30
y=30x10
y=300
\(y:2+y:3+y:5=30\)
\(y:\left(2+3+5\right)=30\)
\(y:10=30\)
\(y=30\times10\)
\(y=300\)
y : 2 + y : 3 + y : 5 = 30
=> y x \(\frac{1}{2}\) + y x \(\frac{1}{3}\)+ y x \(\frac{1}{5}\) = 30
=> y x ( \(\frac{1}{2}+\frac{1}{3}+\frac{1}{5}\) ) = 30
=> y x \(\frac{31}{30}\) = 30
y = 30 : \(\frac{31}{30}\)
y = \(\frac{900}{31}\)
\(y:2+y:3+y:5=30\)
\(y:\left(2+3+5\right)=30\)
\(y:10=30\)
\(y=30.10\)
\(y=300\)
Vậy \(y=300\)
