3х-4=26
3х=26+4
3х=30
х=30:3
х=10
4x^2 - 4x+1 = x-1/2
<span>4x^2 - 4x+1 -x+1/2 = 0
</span><span>4x^2 - 5x+1.5 = 0
</span>D = 25 - 4*4*1.5 = 1
x1 = (5-1) /8 = 1/2
x2 = (5+1) / 8 = 6/8 = 3/4
или
<span>4x^2 - 5x+1.5 = 0
</span><span>4x^2 - 2x-3х+1.5 = 0
</span>2х(2x-1) -1.5(2x-1) = 0
(2x-1) (2x-1.5) = 0
тогда либо 2х-1 = 0
либо 2х-1,5 = 0
х = 1/2
или х= 3/4