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2013年高三一轮复习(文科)苏州大学出版社出版《高中数学教学与测试》自我测试A册第190页第10题为:设函数f(x)=ax-b x,曲线y=f(x)在点(2,f(2))处的切线方程为7x-4y-12=0.(1)求y=f(x)的解析式;(2)证明:曲线y=f(x)上任一点处的切线与直线x=0和直线y=x所围成的三角形的面积
2013 high school a review (liberal arts) Suzhou University Press self-test A high school mathematics teaching and testing self-test A book page 190, the tenth is entitled: Let f (x) = ax-b x, curve y = f (x) The tangent equation at point (2, f (2)) is 7x-4y-12 = 0. (1) Find the analytic formula for y = f x) The area of the triangle enclosed by the tangent at any point and the straight line x = 0 and the straight line y = x