15(у-4) -2(у-9) + 5(y+6)
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у=-х+9 3х=9+6 у=-х+9 3х=15 у=-х +9 х=5 у= -5+9 х=5 у= 4 х=5. Ответ: (5;4) ... Найдите значение дроби y-1/4при у = 3; 1; -5; -1,6 ; 100.
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