Пусть х = а => у = а/5*2= 2a/5 => z = 2*2a/(3*5) = 4a/15.
a/(4a/15) = 15/4 => x:z = 15:4
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Пусть х = а => у = а/5*2= 2a/5 => z = 2*2a/(3*5) = 4a/15.
a/(4a/15) = 15/4 => x:z = 15:4