Oblicz wyrazenia algebraiczne a)(2x-1)^2-4(x-3)(x+3) b)(5a+1)^2+(5a-1)^2-(5a+1)(5a-1)-25a^2 c)(x+2y)^2-(x+2y)(x-2y)+(2x-2y)^2+4xy d)(a-2b)(3a+b)-3(a-b)^2
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