Question

高一数学函数题求解！！

f(x)是定义在[-1，1]上的增函数，且f(x-1)小于f(1-3x)，求x范围

Answer 1

-1<=x-1<=1
-1<=1-3x<=1
f(x-1)<f(1-3x)
则x-1<1-3x
解得0<=x<1/2

Answer 2

0<=x<1/2