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2x²-10<x²+6x+9 +x²-4
-6x<15
x>-15/6
x>2,5
liczba pierwsza 2
liczba niewymierna √7
potęga liczby -2 to np 4 bo (-2)²=4
ZAd.2
3x+20%x=p
3,2x=p
x=p:3,2