Question

已知偶函数f(X)在区间【0,+∝）单调增加,则满足f（2x-1)

Answer 1

case 1:

for

2x-1 >=0

=> x >=1/2

f(2x-1)< f(1/3)

=> 2x-1 < 1/3

x < 2/3

solution for case 1

x >=1/2 and x x > 1/3

solution for case 2

x 1/3

ie 1/3< x < 1/2

solution for f（2x-1)