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x²-4x+4=(x+2)²
x+2/3x-6 =-1(x-2)/3(x-2)=-1/3
b)x(do czwartej)-1/x(do czwartej)+2x(kwadrat)+1
x⁴-1/x⁴+2x²+1=(x²-1)(x²+1)/x²(x²+2)+1=(x²-1)(x²+1)/(x²+1)(x₂+2)=x²-1/x²+2 =
=(x-1)(x+1)/(x²+2)
x=1 i x=-1
4x(kwadrat)-4/x(kwadrat)+1=4x²-4/x²+1=(2x-2)(2x+2)/x²+1=(2x-2)(2x+2)(x-1)/(x+1)(x-1)=(2x-2)(2x+2)/x+1 x=1 i x=-1
c).x(kwadrat)-7x+12/x(kwadrat)-16=(x+4)(x+3)/(x-4)(x+4)=x+3/x-4
x(kwadrat)-7x+12=(x+4)(x+3) x=-4 i x=-3
5x-15/3x+12=5(x-3)/3(x+4) x=3 i x=-4