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Scrieti sub forma de putere urmatoarele produse:

a) -2,5 * (-2,5) * (-2,5) * (-2,5)
b) 1,8(3) * [1,8(3)] * [1,8(3)] * [1,8(3)] * [1,8(3)]
c) -0,41(6) * [-0,41(6)] * [-0,41(6)] * [-0,41(6)] * [-0,41(6)] * [-0,41(6)]