(7m + 0,5n)² = (7m)² + 2 * 7m * 0,5n + (0,5n)² = 49m² + 7mn + 0,25n²
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(7m + 0,5n)² = (7m)² + 2 * 7m * 0,5n + (0,5n)² = 49m² + 7mn + 0,25n²