za rozwiązanie z góry dzięki .
a)(2a-5)(2a+5)=4a²-25
b)(1-pierw. z 6)(1+pierw. z 6)=1-6=-5
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a)(2a-5)(2a+5)=4a²-25
b)(1-pierw. z 6)(1+pierw. z 6)=1-6=-5