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A. x³=1 i x²=1
x=1 x=1ux=-1 NIE!
B. x+1=0 i 1/x+1=0
x=-1 x≠-1 NIE!
C. ( x+1)²=0 i x+1/10=0
x=-1 x=-1 TAK!
D. x⁴-1=0 i x-1=0
x=-1 ux=1 x=1 NIE!