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68=4x
x=17
b)√x=4√3 podnosimy do kwadratu
x=64
c)5√x=40
25x=1600
x=64
2/
(a²-4)/: (a² +4a +4)
(a-2)(a+2)/(a+2)(a+2)
skracamy i wychodzi (a-2)/(a+2)