Opuść nawias i zredukuj wyrazy podobne:
a) 6a(a+1)-g(a²-a)+8a²=
b)2x²(x+1)+8²(1-x)+x³=
c)k²(1-3k)+3(k²-1)-(k²-1)-(k²-3)+1=
d)3a²(-a+3)-2a(4a+1)-a²=
e)4a(4a-1)-2a(4a²-a-2)-2a²=
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