Предмет: Алгебра, автор: PassJir

решить уравнение х + 81х в первой отрицательной степени = 18

Ответы

Автор ответа: dtnth

х + 81х в первой отрицательной степени = 18

x+81x^(-1)=18

x+81/x=18

x^2-18x+81=0

(x-9)^2=0

x=9

проверка: х=9: 9+81*9^(-1)=9+81*1/9=9+9=18

ответ: 9

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