用反证法证明“三角形中至少有一个角不小于60°”，应该先假设这个三角形中（　　）

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：⒈ 每处错误及其修改均仅限一词；

⒉ 只允许修改10处，多者（从第11处起）不计分。

    My uncle lives no far from my home and I visit him every Sunday. Yesterday I visited him with my sister by bikes. As usually, we stayed at his home for a very longer time. We talked about things that had been happened in my school last week, especially the low grades I had got. He encouraged me believe in myself but work harder. The talk with him really cheers me up. He also prepared a delicious meal for us. We three had the good time together. After leave his house, we rode home happily.

如果不等式ax＞1的解集是x<$\frac{1}{a}$，则（　　）