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1. ... = = 2(a+b) - 1/2 * (a-b) = = 2(-4 + 6) - 1/2 * (-4-6)= = 2 * 2 - 1/2 * (-10) = = 4 + 5 = 9 2. ...= = x² - 2² - (9x² + 6x + 1) = = x² - 4 - 9x² - 6x - 1 = = -8x² - 6x - 5 = = -8 * (-2)² - 6 * (-2) - 5 = = -8 * 4 + 12 - 5 = = -32 + 7 = -25 3. ... = = 10x - 5x² - 2 -x + 5x² - x = = 8x - 2 = = 8 * 1,6 - 2 = = 12,8 - 2 = 10,8 4. ... = ... 5(5x + 2) = 3(3x + 6) 25x + 10 = 9x + 18 16x = 8 / : 16 x = 1/2 5. ... = ... / *6 2(2x+1) - 3(3x-2) = 12 - 6x 4x + 2 - 9x + 6 = 12 - 6x x = 4 6. ...=... 2(x² - 6x +9) - (16 + 8x + x²) = x²-6x 2x² - 12 x + 18 - 16 - 8x - x² = x² - 6x 10x = -2 / :10 x = -0,2