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3x= - 1/4 /3 9x^2 -x^2 -5x +x =0
x= - 1/12 8x^2 - 4 x^2 =0
4x( 2x - 2 )=0 to znaczy ze 4x =0 lub 2x-2 =0 z tego wynika ze x=0 lub 2x=2 to x=1
c) x^2 - 4x + 4 = 4
x^2 - 4x= 0
x( x-4) =0 czyli x=0 lub x= 4
d) 1/4x^2 +x = 1/2x+ x^2
0,25 x^2 - x^2 +x - 0,5x = 0
-0.75 x^2 + 0,5 x=0
- 0,25x( 3x - 2) =0
x=0 lub x= 2/3