计算不等积分∫dx/根号9x^2-6x+7

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∫dx / √(9x² - 6x + 7)= ∫dx / √[(3x - 1)² + 6]= 1/3 *∫d(3x - 1) / √[(3x - 1)² + 6]根据：∫dt / √[t² + 6] = t √[t² + 6] / 2 + Ln[t + √[t² + 6]] / 2= 1/ 6 ｛ (3x - ...