q=b2/b1=b3/b2
4x/2x-1=64x^2/4x
16x^2=64x^2(2x-1)
1=4(2x-1)
8x-4=1
8x=5
x=5/8
4x=корень(2x-1)(64x^2)
16x^2=128x^3-64x^2
16x^2(8x-5)=0
x=0 x=5/8
q=b2/b1=b3/b2
4x/2x-1=64x^2/4x
16x^2=64x^2(2x-1)
1=4(2x-1)
8x-4=1
8x=5
x=5/8
4x=корень(2x-1)(64x^2)
16x^2=128x^3-64x^2
16x^2(8x-5)=0
x=0 x=5/8