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2)9x^2-1=0 9x^2=1/:9 x=1/3
3) -4x^2+8x=0 delta=64-4*(-4)*0=64 pierwiastek z delty=8 x1=2 x2=0
4)2x^2-x=0 delta=1-4*2*0=1 x1=0 x2=1/4