1) f(x)=log1/3(2x^2+5x-3)
log1/3(x+3)(2x-1)
(x+3)(2x-1)＞0,﹛x│(-∞,-3)∪(1/2,﹢∞)﹜
2)(-∞,-3),x增大,(x+3)(2x-1)增小,f(x)单调递增
(1/2,+∞),x增大,(x+3)(2x-1)增大,f(x)单调递减