(0,6x + 1,5y)² = (0,6x)² + 2 * 0,6x * 1,5y + (1,5y)² = 0,36x² + 1,8xy + 2,25y²
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(0,6x + 1,5y)² = (0,6x)² + 2 * 0,6x * 1,5y + (1,5y)² = 0,36x² + 1,8xy + 2,25y²