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a²c=b /:a²
c=b/a²
c²=b²/a^4
Odp. D
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zad 28)
(x²-4)/(x+2)=3 ; x≠ -2
(x-2)(x+2) / x+2) = 3 ; skracamy przez x+2
x-2=3
Odp. C wykorzystano wzor : a²-b²=(a-b)(a+b)