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blackkiwi12
@blackkiwi12
September 2021
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решите пожалуйста. Буду признательна.
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Матов
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6/(x^3-7x^2-7x+1) -8/(x^3-8x^2+x) -1/(x^2+x) = 0
6/(x+1)(x^2-8x+1) -8/x(x^2-8x+1) -1/x(x+1) = 0
под общий знаменатель
6x-8(x+1)-1(x^2-8x+1)/(x(x+1)(x^2-8x+1)) =0
(-x^2+6x-9)/(x(x+1)(x^2-8x+1)) =0
-x^2+6x-9=0
x^2-6x+9=0
D=0
x=-6/-2=3
2)
4x^2-(4c-2)x+(c^2-c-2)=0
решим кв уравнение относительно переменной х
D=(4c-2)^2-4*4*(c^2-c-2) = 6^2
x=(4c-2)-6/8 =4c-8/8 =c-2/2
x2=(4c-2)+6/8 =4c+4/8 =c+1/2
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Answers & Comments
Verified answer
6/(x^3-7x^2-7x+1) -8/(x^3-8x^2+x) -1/(x^2+x) = 06/(x+1)(x^2-8x+1) -8/x(x^2-8x+1) -1/x(x+1) = 0
под общий знаменатель
6x-8(x+1)-1(x^2-8x+1)/(x(x+1)(x^2-8x+1)) =0
(-x^2+6x-9)/(x(x+1)(x^2-8x+1)) =0
-x^2+6x-9=0
x^2-6x+9=0
D=0
x=-6/-2=3
2)
4x^2-(4c-2)x+(c^2-c-2)=0
решим кв уравнение относительно переменной х
D=(4c-2)^2-4*4*(c^2-c-2) = 6^2
x=(4c-2)-6/8 =4c-8/8 =c-2/2
x2=(4c-2)+6/8 =4c+4/8 =c+1/2