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X2-4 / (x-2)(x+3) = 0
X2-4 =0 lub x-2=0 lub x+3= 0
czyli x=2 lub x=2 lub, x= -3 czyli B
3. Nie wychodzi mi żadna odpowiedź, ale:
f(x)=(x-1 / x-2)*( x2-4 / x2-1)
f(4)= (4-1 : 4-2)(16-4: 16-1)= 3/2 * 12/15= 6/3= 2