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Những câu hỏi liên quan
DT
Đỗ Thanh Hải
CTVVIP
19 tháng 4 2021
89 The heavy rain prevented us from enjoying the trip
90 You had better not eat too many candied
91 He drives more slowly and more carefully than Lan does
92 The visitor spoke too quickly for me to understand
DT
Đỗ Thanh Hải
CTVVIP
19 tháng 4 2021
1 Can she look after herself while her mother is away?
2 Could you tell me where is the station?
3 The exam was not as difficult as we thought
4 It will be impossible for them to come on Saturday
5 Their father drove to London last Monday
6 You won't need to go to the meeting next week
7 Sonia isn't interested in Roller-skating
8 You had better ride the bike more carefully next time
9 I wasn't allowed to stay out late when I was young
10 He takes care of the sick people
Bài 1:
\(\sqrt{9-4\sqrt{2}}-3\sqrt{16-6\sqrt{7}}=\sqrt{8+1-2\sqrt{8.1}}-3\sqrt{9+7-2\sqrt{9.7}}\)
\(=\sqrt{(\sqrt{8}-1)^2}-3\sqrt{(\sqrt{9}-\sqrt{7})^2}\)
\(=\sqrt{8}-1-3(\sqrt{9}-\sqrt{7})=-10+2\sqrt{2}+3\sqrt{7}\)