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orj
@orj
October 2021
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Решите пожалуйста!!!
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oganesbagoyan
Verified answer
90/(x+4) +90/(x-4) =12 ; * * * ОДЗ: x ≠
± 4 .
15/(x-4) +15/(x-4) =2 ;
15*(x+4) +15*(x-4) =2(x-4)(x+4) ;
15x+60 +15x -60 =2(x² -16) ;
30x =2(x² -16) ;
15x =x² -16 ;
x² -15x -16 =0 ; x=- 1 корень *** 1 -(-15) -16 =0
[ х =
- 1
; x=
16
.
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Answers & Comments
Verified answer
90/(x+4) +90/(x-4) =12 ; * * * ОДЗ: x ≠ ± 4 .15/(x-4) +15/(x-4) =2 ;
15*(x+4) +15*(x-4) =2(x-4)(x+4) ;
15x+60 +15x -60 =2(x² -16) ;
30x =2(x² -16) ;
15x =x² -16 ;
x² -15x -16 =0 ; x=- 1 корень *** 1 -(-15) -16 =0
[ х =- 1 ; x=16.