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Bạn tự vẽ hình nha ^^ a)Xét tứ giác AECH có: IH=IE(E là điểm đối xứng với H qua I) Và:IA=IC(I là trung điểm của AC) $\Rightarrow $ Tứ giác AECH là hình bình hành Và có:$ \angle$ AHC=90$^{\circ}$ Nên tứ giác AECH là hình chữ nhật b)Ta có tứ giác AECH là hình chữ nhật Theo đề bài cho: 2(HC+AH)=28...

Bài 1: a)$(5-2x)^2-16=0\\\Leftrightarrow (5-2x)^2-4^2=0\\\Leftrightarrow (5-2x-4)(5-2x+4)=0\\\Leftrightarrow (1-2x)(9-2x)=0$ $\Leftrightarrow 1-2x=0$ hoặc$9-2x=0$ $\Leftrightarrow x=\frac{1}{2}$ hoặc $x=\frac{9}{2}$ Vậy$S=\left \{ \frac{1}{2};\frac{9}{2} \right \}$ b)$x^2-4x=29\\\Leftrightarrow...

1. Mozart (write) wrote more than 60 pieces of music. 2. "How did you learn to drive?" - My father (teach) taught me. 3. We couldn't afford to keep our car, so we (sell) sold it. 4. I was very thirsty. I (drink) drank the water very quickly. 5. Paul and I played tennis yesterday. He...

1. My uncle’s farm has 5,000 chickens __C__ 2. Chicken _U__ is good for health. 3. I don’t like eating fish __U__ 4. Fish __U___ live under the water 5. This window is made from glass __U__ 6. Please give me a glass of milk __C__ 7. His work __U__ is not hard. He is an official worker. 8...

1. whale:C 2. luggage:U 3. darkness:U 4. air:U 5. water:U 6. exam:C 7. desk:C 8. news;U 9. money;U 10. tree:C 10/10

Bài...

Lâu lâu mới thấy chee onl đấy ^^

381. The post . ............................ every morning. A. is delivered B. was delivered C. delivered D. being delivered 382. Milk . ............................ in Moc Chau. A. are made B. aren’t made C. is made D. made 383. A new school . ...

1.Because Mr Ha has no money, he has no friends no love. ----->Because of having no money,Mr Ha has no friends no love. 2. Although we admire his intelligence, we can’t stand his selfishness. ----->We admire his intelligence but we can’t stand his selfishness. 3. Inspite of working very hard...

1. My brother hadn’t never been to Europe until he went there last year.---->had 2. When I first saw her, she has been standing on the balcony.----->was standing 3. Really? You moved to a new apartment? How long did you live there?----->have you lived 4. Diane feels very sick but she decided to...

Mọi người cứ bình tĩnh đi sẽ có đề mà

$(\frac{\sqrt{x}+\sqrt{y}}{\sqrt{x}-\sqrt{y}}+\frac{\sqrt{x}-\sqrt{y}}{\sqrt{x}+\sqrt{y}}):\frac{\sqrt{xy}}{x-y}\\=\frac{(\sqrt{x}+\sqrt{y})(\sqrt{x}+\sqrt{y})+(\sqrt{x}-\sqrt{y})(\sqrt{x}-\sqrt{y})}{(\sqrt{x}-\sqrt{y})(\sqrt{x}+\sqrt{y})}.\frac{x-y}{\sqrt{xy}}\\=\frac{(\sqrt{x}+\sqrt{y})^2+(\sqr...