D=16+4*5=36=6²
x1=(-4-6)/2=-5
x2=(-4+6)/2=1
x²+4x-5=(x+5)(x-1)
Подставляешь значение функции
1) f(x) = 1/2x-4
2 = 1/2x - 4
6 = 1/2x
x =12
2) f(x) = 1/x
10 = 1/x
1/x = 10
x = 1/10
x = 0,1
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1) а) 9
б) 1
2) а) №6
б) к+м
4) а) №10/3
б) №3/2
5) 4