如图
1/(3-x)>1 1+ 1/(x-3)<0 (x-3+1)/(x-3)<0 (x-2)/(x-3)<0 2
4/x≥1
4/x-1≥0
(4-x)/x≥0
(4-x)·x≥0
(x-4)·x≤0
x∈(0,4]
4/x≥11- 4/x≤0(x-4)/x≤00不等式的解集为(0，4]
图
