13.计算 (log )_(5)35+2(log )_(dfrac {1)(2)}sqrt (2)-(log )_(5)dfrac (1)(50)-(log )_(5)14 的值为 2-|||-__-|||-14. 已知函数 f(x)=-|||-(log )_(a)(x)^2+(a)^|x|(agt 0,且aneq 1), 若 (-3)lt f(4), 则不-|||-等式 ((x)^2-3x)lt f(4) 的解集为 (-1,0)cup (0,3)cup (3,4)-|||-15.已知实数a,b满足 (log )_(dfrac {1)(2)}a=(log )_(dfrac {1)(3)}b, 下列五个关系式:-|||-circled (1)agt bgt 1, ② lt blt alt 1, ③ gt agt 1, ④ lt alt blt 1,-|||-circled (5)a=b. 其中不可能成立的关系式有 2 个.-|||-16.若函数 f(x)= { ,1)