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JuliaHoff
@JuliaHoff
July 2022
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Помогите по-братски! Очень надо! Срочно! Даю 50 баллов!!!
2/х-7+15/х+6=2 (дробно-рациональное уравнение)
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Dимасuk
Verified answer
2/(x - 7) + 15/(x + 6) = 2
ОДЗ:
x ≠ -6; 7
Умножим всё уравнение на (x + 6)(x - 7)
2(x + 6) + 15(x - 7) = 2(x - 7)(x + 6)
2x + 12 + 15x - 105 = 2(x² + 6x - 7x - 43)
17x - 93 = 2x² - 2x - 86
2x² - 19x + 9 = 0
D = 19² - 9·4·2 = 361 - 72 = 289 = 17²
x₁ = (19 + 17)/4 = 36/4 = 9
x₂ = (19 - 17)/4 = 2/4 = 1/2
Ответ: x = 1/2; 9.
1 votes
Thanks 5
sedinalana
Verified answer
2/(x-7)+15/(x+6)=2
О.З.(x-7)(x+6)≠0⇒x≠7;x≠-6
2*(x+6)+15(x-7)=2(x-7)(x+6)
2x²+12x-14x-84-2x-12-15x+105=0
2x²-19x+9=0
D=361-72=289
x1=(19-17)/4=0,5
x2=(19+17)/4 =9
4 votes
Thanks 2
JuliaHoff
кому довериться: тебе или ему? о.о
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Answers & Comments
Verified answer
2/(x - 7) + 15/(x + 6) = 2ОДЗ:
x ≠ -6; 7
Умножим всё уравнение на (x + 6)(x - 7)
2(x + 6) + 15(x - 7) = 2(x - 7)(x + 6)
2x + 12 + 15x - 105 = 2(x² + 6x - 7x - 43)
17x - 93 = 2x² - 2x - 86
2x² - 19x + 9 = 0
D = 19² - 9·4·2 = 361 - 72 = 289 = 17²
x₁ = (19 + 17)/4 = 36/4 = 9
x₂ = (19 - 17)/4 = 2/4 = 1/2
Ответ: x = 1/2; 9.
Verified answer
2/(x-7)+15/(x+6)=2О.З.(x-7)(x+6)≠0⇒x≠7;x≠-6
2*(x+6)+15(x-7)=2(x-7)(x+6)
2x²+12x-14x-84-2x-12-15x+105=0
2x²-19x+9=0
D=361-72=289
x1=(19-17)/4=0,5
x2=(19+17)/4 =9