44 Efectuați:
a (-1)×(-1)²×(-1)³×.....×(-1)²⁰=
b (-1)+(-1)²+(-1)³+.....+(-1)²⁰=
c (-1)-(-1)²-(-1)³-.......-(-1)²⁰=
d (-2)×(-2)²×(-2)³×.....×(-2)²⁰:(-8)⁷⁰




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