题目

(1)计算：.(2)解方程：3x2﹣4x﹣1＝0． 答案：【答案】(1)3+；(2)x1＝，x2＝【解析】（1）把，零次幂和负整数指数幂一一化简，再进行运算即可.（2）运用公式法求解即可.解：(1)原式＝2×﹣1+4＝3+.(2)3x2﹣4x﹣1＝0．x1＝＝＝x2＝ ＝＝4、In the year 2000, Ye Zijie was invited to study in London and became the first     (视觉) impaired Chinese to study abroad.