Ответ: C) -2.
Объяснение:
4/x - 4/(x+2)=1;
4(x+2) - 4x = x(x+2);
4x+8-4x = x^2+2x;
x^2+2x-8=0;
По т. Виета
x1+x2=-2;
x1*x2=-8;
x1=-4;
x2=2.
----------------
x1+x2=-4+2 = -2!!!
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Ответ: C) -2.
Объяснение:
4/x - 4/(x+2)=1;
4(x+2) - 4x = x(x+2);
4x+8-4x = x^2+2x;
x^2+2x-8=0;
По т. Виета
x1+x2=-2;
x1*x2=-8;
x1=-4;
x2=2.
----------------
x1+x2=-4+2 = -2!!!