3у/8 + у -у/4 = 3у/8 + 8у/8 - 2у/4 = 9у/8
при у = 2 2/3 = 8/3 получим 9 · 8/3 : 8 = 3
при у = 4/9 получим 9 · 4/9 : 8 = 1/2 = 0,5
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3у/8 + у -у/4 = 3у/8 + 8у/8 - 2у/4 = 9у/8
при у = 2 2/3 = 8/3 получим 9 · 8/3 : 8 = 3
при у = 4/9 получим 9 · 4/9 : 8 = 1/2 = 0,5