网=+】 则x In f(x)x[In(2x+1)-In 2x] 名网=m2x*)-h29t2名 w=2会m+22 w=0++宁-2-月1 1 ( ) 1 , ( ) 2 x x f x f x x =   = + =      14.设 则 ln ( ) [ln(2 1) ln 2 ] f x x x x = + − 1 2 1 ( ) [ln(2 1) ln 2 ] ( ) ( ) 2 1 f x x x x f x x x  = + − + − + 1 1 1 ( ) 1 [ln(1 ) ] 2 2 2 1 x f x x x x    = + + −     + 1 1 1 (1) (1 )[ln(1 ) ] 2 2 2 1 f  = + + − + 3 3 1 ln 2 2 2 = −