f(x)={2X-1(X>0)}解不等式X分之f(x)大于0 3-X (X≤0)

问题描述:

f(x)={2X-1(X>0)}解不等式X分之f(x)大于0 3-X (X≤0)

x>0
f(x)=2x-1>0
x>1/2
x≤0
f(x)=3-x>0
x1/2