Odpowiedzi

2009-11-24T19:51:58+01:00
1) (x+5)/(x+1) = x/(x+2)
x(x+1) = (x+5)(x+2)
x²+x = x²+2x+5x+10
-6x = 10 |÷(-6)
x = -¹⁰/₆
x = -⁵/₃

2) x/2,1 = 3,5/(2x-1)
x(2x-1) = 2,1*3,5
2x²-x = 7,35
2x²-x-7,35 = 0

Δ=b²-4ac=1+58,8=59,8
√Δ = √59,8

x₁=(-b-√Δ)/2a v x₂=(-b+√Δ)/2a
x₁=(1-√59,8)/2 v x₂=(1+√59,8)/2