y-yo=2xo(xxo yo o A(7x0,0)C(8,0)B(8,16x0-x2) 2 °如△4BC (8 206-2 x0)(16x-x2) =64x。-8X040(x0∈[0,8l) 2 令S=0→64-16xn+3x2=0T x y o P A B C y−y0=2x0 (x−x0 ) ∵ y0=x0 2 ∴ A , 0) 2 1 ( 0 x C(8, 0) B(8, 16x0−x0 2 ) )(16 ) 2 1 (8 2 1 2  SABC = − x0 x0 − x0 (x0[0, 8]) 令S=0 0 4 3 64 16 2  − x0 + x0 = 3 0 2 0 0 4 1 = 64x − 8x + x