Cho phương trình phản ứng Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O Tổng hệ số của các chất trong PTHH trên là:

V. Used to: (+): S + used to + V (bare inf.) (-): S + didn’t + use to + V (bare inf.) (?): (WH-word) did + S + use to + V (bare inf.)...? Exercise: 1. I lived on a farm once, but I don’t any more. I used_______________________________________________________ 2. I usually watched football every Sunday last year. I used ________________________________________________________ 3. There was a lake behind my parents’ house. There used ____________________________________________________ 4. I usually stayed up late to watch football matches last year. I used ________________________________________________________ 5. There were some trees in the field. There used ____________________________________________________ 6. She doesn’t live with her parents any more. She used ______________________________________________________ 7. I often played volley every Sunday morning last year. I used ________________________________________________________ 8. He is not a poor man any more. He used ____________________________________________________ giúp em với ạ

Câu1: trong mặt phẳng tọa độ Oxy cho điểm M(1;2) đường thẳng d / 2 * x - y + 1 = 0 ; đường tròn (C) / (x ^ 2) + y ^ 2 - 2y + 4y - 1 = 0 ; Vector v=(-2;-3) . a) Tìm tọa độ điểm Mư' là ảnh của M theo T_{p} b) Tìm tọa độ đường thẳng d” là ảnh của d theo T vec P c) Tìm tọa độ (C") là ảnh của (C) theo T_{p} . d) Tìm tọa độ điểm D sao cho M là ảnh của D theo T_{p} .

VIII. Read and match sentences A-F with gaps 1-5 in the text. There is one extra sentence.Polar bears live where the ice meets the sea in the Arctic Circle. They are born on land, but they spend mostof their time in the water. (1) ……………………………… However, the polar bear is specially adapted for lifein such a cold place.The most important adaptation is their fur. A polar bear's fur has both long and short hairs, which means thatit is very thick. This thick fur keeps the bear warm on the land and stops it getting wet when it is swimming.(2) ……………………………… This means that the bear appears to be white like the snow and ice around it.The skin under the fur is black. Because of its colour, the skin absorbs the sun's heat and gives the bearextra warmth.Under a polar bear's thick fur and black skin is a layer of fat. This layer can be up to 12 cm thick and itprotects the bears from the cold. (3) ……………………………… Polar bears hunt seals for food and theseare difficult to find in the summer when the ice melts.The shape of a polar bear’s body is also especially designed for the life in the Arctic. (4)……………………………… All of their body is covered with fur except for the end of their nose. Their roundshape stops the body from losing heat and it helps the bears tolerate the cold.Polar bears also have fur on the bottoms of their feet, which are enormous. (5) ………………………………The fur helps the bears walk in the soft snow and also stops them from falling on the ice. The size of theirfeet helps them to swim faster, too.A. Polar bears have a very large body with a small head and very small ears.B. The hairs are transparent and so the reflect the light from the sun.C. Sometimes the bears can get too hot, so they jump into the water to cool off.D. They look like giant snowshoes and they work in the same way.E. The temperature in the Arctic can be as low as -45ºC in the winter.F. The bears can also use it for energy when there isn’t anything to eat.

Khối lượng của 8,96 lít khí Cl2 (đktc) là:

Em cần giúp luôn ạ , làm đúng e sẽ vote 5 sao

Ai giúp tui vs tỏ tình nữa nè T^T Vẽ đậu mầm

Cho tam giác ABC vuông tại A có B=60, BC=6cm a) Tính độ dài AB,AC b)Kẻ đường cao AH của tam giác ABC .Tính HB ,HC c) Trên tia đối của tia BA lấy D sao cho BD=DC.Chứng minh AB/BD=AC/CD d)Từ A kẻ đường thẳng song song với phân giác CBD cắt CD tại K. Chứng minh 1/KD.KC =1/AC2 +1/AD2

Mọi ngừoi giúp em làm câu này với ạ 🙏🏻🙏🏻🙏🏻

giúp em với ạ ( hứa sẽ vote đủ ) :((