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b) a²+4-a²+4
c) 2a²-ab+4ab-2b²
2x *5x - 2-2x*1
10x-2-2x*1
8x-2*1
8x-2
b)(a+2)do kwadratu -(a-2)do kwadratu
(2a)do kwadratu
c)(a+2b)(2a-b)-3ab
3a + b - 3ab