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b) = 2(x-2)/2x= x-2/x
c) = 3ab*2ab²/3ab= 2ab²
d) = x^4y^-3
e) = (x-5)(x+5)(x-3)²/x(x-4)(x+5)=(x-5)(x-3)²/x(x-4)= (x-5)(x²-6x+9)/x(x-4)= x³-6x²+9x-5x²+30x-45/x(x-4)= x³-11x²+39x-45/x(x-4)= x(x²-11x+39)-45/x(x-4)= x²-11x+39-45/x-4= x²-11x-6/x-4
Tego ostatniego nie jestem do końca pewna.