(4a-3b)x＞2b-a的解集为x＜4/9 可知4a-3b＜0 (4a-3b)x＞2b-a x＜(2b-a)/(4a-3b)=4/9 得b/a=5/6即b=5a/6 把b=5a/6代入4a-3b＜0得 4a-35a/6＜0 得a＜0 ax＞b x＜b/a=5/6 ax＞b的解集是x＜5/6