题目

计算：2﹣18+3﹣8． 答案：【答案】2+7【解析】直接化简二次根式进而合并得出答案．原式=2×4﹣18×+3×3﹣8×=8﹣6+9﹣2=2+7．4. The meeting is beginning. I have to 1        now.