HOC24
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Chủ đề / Chương
Bài học
Tổ một trồng được 25 cây, tổ hai trồng được gấp 3 lần tổ một. Hỏi cả hai tổ trồng được bao nhiêu cây
V- Finish the second sentence so that it has the same meaning as the first one:
1- Lan’s brother gave her a story forher birthday. =>Lan was given a story by her brother in her birthday.
2- It was such a bad news that Mai burst into tears. =>The news was so bad that Mai burst into tears. 3- If Hong doesn’t study harder, she’ll fail the exam. =>Unless Hong study harder, she'll fail the exam. 4- I’d like to visit England more than any other country in the world. =>England is the country that I'd like to visit most. 5- The flight to Ho Chi Minh city lasted one hour and a half. =>It took one hour and a half to fly to Ho Chi Minh city. 6- The organizers will exhibit the paintings till the end of the month. =>The paintings will be exhibited till the end of the month. 7- She last wore that dress at her sister’s wedding. =>She hasn’t worn that dress since her sister’s wedding. 8- Computers are used to design new models. =>People use computers to design new models. 9- When did you start working in that factory ? =>How long have you worked in that factory? 10-It isn’t necessary for students to wear uniforms today. =>Students don't need to wear iniforms today.
A=\(4x^2-4x+3\)
=\(\left(2x\right)^2-2.2.x+1+2\)
=\(\left(2x-1\right)^2\) +2
Vì \(\left(2x-1\right)^2\)\(\ge\)0\(\forall x\)
=>A\(\ge\)2
Dấu"=" xảy ra khi:2x-1=0=>x=1/2
Vậy GTNN của A=2<=>x=1/2
KHI ĐI LÊN MẶT TRĂNG HOẶC NẾU MÀ Ở TRÁI ĐẤT THÌ KHI TRĂNG RẰM ẤY NHÉ!
TÍCH NHA
Could I take two weeks' holiday in July?I'd love to take the first two weeks, but if it is not possible, the last two weeks will be OK.Also,can I take three extra days in the first week of December?
1. Tim doesn't play any musical instrumment. ( his father )
His father .doesn't,either........
Neither .does his father............
đ nha bn
When you are traveling long distances by plane, you will feel _____ and it can leave you feeling completely wrecked for several days to a week after you arrive at your destination. A. attentive B. jet- lagged C. hospitable
a,\(x^2+4x+3\)
=\(x^2+3x+x+3\)
=\(x\left(x+3\right)+\left(x+3\right)\)
=(x+3)(x+1)
b,\(2x^2+3x-5\)
=\(2x^2+5x-2x-5\)
=x(2x+5)-(2x+5)
=(2x+5)(x-1)
c,\(16x-5x^2-3\)
=\(-\left(5x^2-16x+3\right)\)
=\(-\left(5x^2-x-15x+3\right)\)
=-[x(5x-1)-3(5x-1)]
=-[(5x-1)(x-3)]
=-(5x-1)(x-3)
\(x^2+2xy+y^2-25\)
<=>\(\left(x+y\right)^2-25\)
<=>\(\left(x+y\right)^2-5^2\)
<=>(x+y+5)(x+y-5)