Решить уравнение 72/(х+5) + 54/(х-5)=9. Created by akikoaki. algebra-ru

(х-5)=9...

July 2022 1 9 Report

Решить уравнение
72/(х+5) + 54/(х-5)=9

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litanalove (72(x-5) +54(x+5)) /(x² -25) =9

72x -360 +54x +270 =9(x² -25)

126x -90 -9x² +225 =0

-9x² +126x +135 =0; :(-9)

x² -14x -15 =0

D =14² +4*15=256=16²

x1=(14-16)/2 = -1

x2=(14+16)/2=15

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akikoaki July 2022 | 0 Ответы

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