4/9 + 1/6 = 11/18，具体计算步骤如下：= 4/9 + 1/6 = 8/18 + 3/18 = (8+3)/18 = 11/18结果是11/18。请采纳。
4/9+1/6=8/18+3/18=11/18
4/9+1/6=11/18
