几何解释: X=g(r) l=f(x) 在曲线弧AB上至少有 B 点C(g(4),f(4),在 该点处的切线平行于 D 弦AB. 0Fa)F(5) F(S2F(6)x x=g(t) y=/1sq≤t≤b f(s f(b)-f(a (g(a),f(a),B(g(b),f(b)g(5)8(b)-8(a) Economic-mathematics 278 Wednesday, February 24, 2021Economic-mathematics 27- 8 Wednesday, February 24, 2021 ( ) 1 F  ( ) 2 o F  x y    = = ( ) ( ) Y f x X g x F(a) A F(b) B C D 几何解释: . ( ( ), ( )), AB C g f AB 弦 该点处的切线平行于 一点 在 在曲线弧 上至少有   ( ( ), ( )), ( ( ), ( )) , ( ) ( ) A g a f a B g b f b a t b y f t x g t      = = ( ) ( ) ( ) ( ) ( ) ( ) ' ' g b g a f b f a g f − − =  