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(0,25)⁻²× (0,25)⁴ = (0,25)^(-2+4) = 0,25² = 0,0625
(2×7)³ × 7² × = 2³×7³×7²× = 2^(3-1) × 7^(3+2-5) = 2² × 7⁰ = 2²