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NT
1
26 tháng 12 2015
\(\int^{x\sqrt{y}+y\sqrt{x}=30}_{x\sqrt{x}+y\sqrt{y}=35}\Leftrightarrow\int^{\sqrt{xy}\left(\sqrt{x}+\sqrt{y}\right)=30}_{\left(\sqrt{x}+\sqrt{y}\right)^3-3\sqrt{xy}\left(\sqrt{x}+\sqrt{y}\right)=35}\)
\(\Leftrightarrow\int^{\sqrt{xy}\left(\sqrt{x}+\sqrt{y}\right)=30}_{\left(\sqrt{x}+\sqrt{y}\right)^3-90=35}\Leftrightarrow\int^{\sqrt{xy}=6}_{\sqrt{x}+\sqrt{y}=5}\)
VH
1
TB
0
BT
12 tháng 7 2023
1. They __had bought____a new flat Before they ( move ) …moved………here (buy)
2. We __have not planed____our holiday yet. (not/ plan)
3. Mr Lam has just ___gone___ out for 2 hours (go)
4. I ___did not finished___ my plan 2 hours ago (not/finish)
5. __Has____ he ___learned___ this lesson yet? ( learn)
6.There is she? I (wait)_have waited_____ for her since 5 o’clock!
7. It’s 9 am today . We ( go ) …are going………on a pinic
8. How long have you (study) __ been studying____ English? For 5 years
9. Why are your hands so dirty? – I (repair)___was repairing___ my bike
10. I (go) __will go____ home after I (finish) __finish____ their work.
11. His train ( leave ) …will leave……………..here 6.am tomrorrow
12. After taking a bath, she (go) __went____ to bed.
13. It was very noisy next door. Our neighbours …were having..(have) a party.
14. Hoa and I went for a walk. I had difficulty keeping up with her because she ...was walking … (walk) so fast
15. Tim was sitting on the ground. He was out of breath. He ..was running… (run)
16. When Phuong arrived, everybody was sitting round the table with their mouths full. They ...were eating… (eat)
QN
2
H
4 tháng 3 2023
`(3/4 +1/2): 3/4`
`=(3/4 +2/4) xx 4/3`
`= 5/4 xx 4/3`
`=20/12`
`= 5/3`
`-----`
`(3/4 +1/2) : 3/4`
`= 3/4 : 3/4 + 1/2 : 3/4`
`= 1 + 1/2 xx 4/3`
`=1+ 2/3`
`= 3/3+2/3`
`=5/3`
VM
8 tháng 7 2018
1. he want to go to camping
mình chỉ biết giải câu 1 thôi, mong bạn thông cảm
