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(2½)²-2 × 1¼² + 2½×1¼ = 6.25-2×1.56+1.17=6.25-3.12+1.17=4.30
(2½)²-2 × 1¼² + 2½×1¼ = 6,25 - 2 * 25/16 + 25/8 = 6,25 - 3⅛ + 25/8 = 6,25