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Cho M là điểm bất kì trên AB. vẽ về 1 phía của AB các hình vuông AMCD và BMEF.
a, Chứng minh AE vuông góc BC
b, Gọi H là giao điểm của AE và BC. Chứng minh D;H;F thẳng hàng
Tìm GTNN của:
A=\(|x-2|+|2x-3|+|4x-1|+|5x-10|\)
B=\(\sqrt{x^2+1}+\sqrt{x^2-2x+5}\)
Giải các phương trình sau:
a, \(\left(\sqrt{x+5}-\sqrt{x+2}\right)\left(1+\sqrt{x^2+7x+10}\right)=3\)
b,\(\dfrac{2x^2}{\left(3-\sqrt{9+2x}\right)^2}=x+21\)
IX.
1.now
2.since
3.tomorrow
4.yesterday
5.for
6.already
7.ago
8.still
9.just
10.recently
X.
1.computed
2.saving
3.connection
4.amusement
5.challenger
6.agreement
7.darkness
8.restriction
9.accept
10.requirement
1.The kind man will help them
2.This school doesn't teach French
3.Did Mozart write this symphony ?
4.They decorated the christmas trees and put at the front door
5. Someone stole my camera from my hotel a few day ago
6.Nam can answer most of the question
7..They are going to build a new supermarket next year
8.How often do they feed these animals?
Hello. We are from Neptune, the eighth planet from the sun in the solar system. Our planet is named after the Roman Sea god. The weather is very unfriendly, with a temperature of around -300 degrees celsius and very strong winds. Actually, we have a lot of storms here. Everything is frozen on the surface of Neptune, so of course we do not have water. In order to survive here, we had to build all our cities underground, 100km from the ground. Fortunately we have no Neptune earthquake!
Our life is very different from your life on earth. Because it is very dark under the ground, we have very good lighting systems. Every day we need 3 hours to sleep, 4 hours to work and the rest of the day we spend on relaxing activities. Life is relaxed. Most of us like to travel to new cities for a new experience. Although we are smaller than you, we can move very fast. Indeed we have wings, so we can fly. We are not overcrowded like your earth. We do not breathe oxygen, but we live on hydrogen.
1.b fossil fuel 2.d until 15. b means 16.d have 17.b polluted 18. c solar 19.b traffic jams 20.b at
1. toothbrush
2. table
3. face
4. black
5. school
6. feed
7. getting