Предмет: Математика, автор: Darkie

не вычисляя корней уравнения 2x^2+x-4=0 найдите frac{1}{x1^2} + +  frac{1}{x2^2}

Ответы

Автор ответа: amahone
0
1/x1^2+1/x2^2=(x1^2+x2^2)/(x1*x2)^2

x1+x2=-1/2
x1*x2=-2
x1^2+2x1*x2+x2^2=1/4
x1^2+x2^2=1/4-2*(-2)=4,25
4,25/4=1.0625
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