解碧孝:ax+1-2x>2(3a+1/2ax) ax+1-2x>6a+ax 1-2x>6a 1-6a>明睁2x 1/2-3a>x 即 x<1/2-3a. 而解集是x<0,因此1/悔槐稿2-3a=0,解得:a=1/6.
ax+1-2x>2(3a+1/2ax)移悉团毕睁芹项,化简得x<1/2-3a由于解集为x<0得或念a=1/6