Ai giúp em bài 16 này với ạ, em cảm ơn
Ai giúp em bài này với ạ em cảm ơn nhiều nha!!!
\(a-b=2\Leftrightarrow a=b+2\)
\(P=3a^2+b^2+8\\ P=3\left(b+2\right)^2+b^2+8\\ P=3b^2+12b+12+b^2+8\\ P=4b^2+12b+20\\ P=\left(4b^2+12b+9\right)+11\\ P=\left(2b+3\right)^2+11\ge11\forall a;b\)
Dấu "=" xảy ra \(\Leftrightarrow b=\dfrac{-3}{2}\)
Pmin = 11
Ai làm giúp em bài 11 này với em cảm ơn ạ.
a: Ta có: EC//AB
AB⊥CD
Do đó: EC⊥CD
=>ΔCED nội tiếp đường tròn đường kính CD
=>O là trung điểm của CD(Vì C,E,D cùng nằm trên đường tròn O)
=>E,O,D thẳng hàng
b: Xét (O) có
ΔAEB nội tiếp
AB là đường kính
DO đó: ΔAEB vuông tại E
Xét tứ giác AEBD có
O là trung điểm của AB
O là trung điểm của ED
Do đó: AEBD là hình bình hành
mà \(\widehat{AEB}=90^0\)
nên AEBD là hình chữ nhật
Ai giải giúp em bài này với ạ. Em cảm ơn nhìuuuuu
AI giúp em câu b bài này với ạ em cảm ơn nhiều nha!!
\(A=\sqrt{2a\left(b+1\right)}+\sqrt{2b\left(c+1\right)}+\sqrt{2c\left(a+1\right)}\)
\(A=\dfrac{1}{\sqrt{2}}\sqrt{4a\left(b+1\right)}+\dfrac{1}{\sqrt{2}}\sqrt{4b\left(c+1\right)}+\dfrac{1}{\sqrt{2}}\sqrt{4c\left(a+1\right)}\)
\(A\le\dfrac{1}{2\sqrt{2}}\left(4a+b+1\right)+\dfrac{1}{2\sqrt{2}}\left(4b+c+1\right)+\dfrac{1}{2\sqrt{2}}\left(4c+a+1\right)\)
\(A\le\dfrac{1}{2\sqrt{2}}\left[5\left(a+b+c\right)+3\right]=2\sqrt{2}\)
\(A_{max}=2\sqrt{2}\) khi \(a=b=c=\dfrac{1}{3}\)
Coá ai ko giúp em bài này với ạ. Em đang cần gấp trước 1h00 . Em xin cảm ơn
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giúp em bài này với ạ ! Em cảm ơn ạ
a) \(\dfrac{A}{x-3}=\dfrac{y-x}{3-x}\left(Đk:x\ne3\right)\)
\(A=\dfrac{\left(x-3\right)\left(y-x\right)}{3-x}=x-y\)
b) \(\dfrac{5x}{x+1}=\dfrac{Ax\left(x-1\right)}{\left(1-x\right)\left(x+1\right)}\left(Đk:x\ne\pm1\right)\)
\(A=\dfrac{5x\left(1-x\right)\left(x+1\right)}{x\left(x-1\right)\left(x+1\right)}=-5\)
c) \(\dfrac{4x^2-5x+1}{A}=\dfrac{4x-1}{x+3}\left(Đk:x\ne-3;A\ne0\right)\)
\(A=\dfrac{\left(4x^2-5x+1\right)\left(x+3\right)}{4x-1}=\dfrac{\left(x-1\right)\left(4x-1\right)\left(x+3\right)}{4x-1}\)
\(=\left(x-1\right)\left(x+3\right)=x^2+2x-3\)
Có ai giúp em bài này với ạ! EM CẢM ƠN Ạ!
jogging photography gardening basketball gymnastics cycling bird-watching chess dancing ice skating |
1.__________ : a game played by two people on a square board, in which each player has 16 pieces thay can be moved on the board in different ways.
2.__________ : the job or activity of working in a garden, growing and taking care of the plants, and keeping it attractive.
3.__________ : a game played by two teams of five men or six women who score points by throwing a large ball through an open net hanging from a metal ring.
4.__________ : the sport or activity of riding a bicycle.
5.__________ : the art of moving your body to music.
6.__________ : moving across ice using special shoes with a thin metal bar fixed to the bottom that you wear to move quickly on ice.
7.__________ : the activity of running at a slow regular speed, especially as a form of exercise.
8.__________ : the hobby of studying wild birds in their natural environment.
9.__________ : the hobby of studying wild birds in their natural environment, physical exercises and activities performed inside, often using equipment such as bars and ropes which are intended to increase the body’s strength and the ability to move and bend easily.
10._________ : the activity or job of taking photographs or films.
1. chess
2. gardening
3. basketball
4. cycling
5. dancing
6. ice skating
7. jogging
8. bird-watching
9. gymnastics
10. photography
1._______chess___ : a game played by two people on a square board, in which each player has 16 pieces thay can be moved on the board in different ways.
2.____gardening______ : the job or activity of working in a garden, growing and taking care of the plants, and keeping it attractive.
3._____basketball_____ : a game played by two teams of five men or six women who score points by throwing a large ball through an open net hanging from a metal ring.
4._____cycling_____ : the sport or activity of riding a bicycle.
5.___dancing_______ : the art of moving your body to music.
6._ice skating_________ : moving across ice using special shoes with a thin metal bar fixed to the bottom that you wear to move quickly on ice.
7.____jogging______ : the activity of running at a slow regular speed, especially as a form of exercise.
8.__________ : the hobby of studying wild birds in their natural environment.
9.______bird-watching____ : the hobby of studying wild birds in their natural environment, physical exercises and activities performed inside, often using equipment such as bars and ropes which are intended to increase the body’s strength and the ability to move and bend easily.
10.___photography______ : the activity or job of taking photographs or films.
Giúp em bài này với ạ Em cảm ơn mn trc ạ
1 A
2 D
3 A
4 C
5 C
6 A
7 A
8 B
9 D
10 A
11 D
12 D
13 C