Zapisz w postaci jak najprostszej sumy algebraicznej:
a) (x+1)(x+4) d) 1-(z+5)(z-1)
b) 2(2x+3)(2x-1) e)2k2-(k+3)(2k+4)
c) -(x+7)(x-3) f)-3(a+2b)(a-b)+3a2
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