http://zhidao.baidu.com/q?word=1%2F3%2B3%2F4%2B2%2F5%2B5%2F7%2B7%2F8%2B9%2F20%2B10%2F21%2B11%2F24%2B12%2F35&ct=17&pn=0&tn=ikaslist&rn=10&lm=0&fr=search
以后碰到这类指数比较少的题目就先去知道上搜下,不然很多人也会去搜出答案再给你回答. 而却这类题目挺简单的动动脑也答案也就出来来了
http://zhidao.baidu.com/q?word=1%2F3%2B3%2F4%2B2%2F5%2B5%2F7%2B7%2F8%2B9%2F20%2B10%2F21%2B11%2F24%2B12%2F35&ct=17&pn=0&tn=ikaslist&rn=10&lm=0&fr=search
以后碰到这类指数比较少的题目就先去知道上搜下,不然很多人也会去搜出答案再给你回答. 而却这类题目挺简单的动动脑也答案也就出来来了