Предмет: Алгебра, автор: LUSINA228

решите неравенство: 2x^2 -9x +4 <= 0. В ответе укажите сумму целых решений неравенства

Ответы

Автор ответа: aleksano97
6
элементарно, 
вводим функцию f(x)= 2x^2-9x+4
приравниваем  к 0
2x^2-9x+4=0
D= B^2-4ac
D=81-(4*2*4)= 49+корень =7
x1= 9+7/4= 4
x2=9-7/4= 0,5
чертим числовую ось относительно х
получается промежуток включая [0,5; 7] , целые : 1, 2, 3, 4, 5, 6,7,сумма их 28 
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