cho tam giác ABC vuông tại A biết AB/BC=3/5 và AC=20cm.Tính chu vi tam giác ABC

Làm hộ mk bài 5 với Mk cần gấp

Các bạn giúp mình với!!!!! Cho đường tròn (O) bán kính OA, dây CD là đường trung trực OA a) Tứ giác OACD là hình j?? b) Tiếp tuyến tại C của (O) cắt OA tại I. Tính độ dài CI biết OA = R

X. Read the text, then decide whether the following statements are true (T) or false (F). These are some easy habits that help you stay healthy and live longer. Go for a jog Exercise is key to good health. Aerobic activity, like running, is crucial for getting your blood pumping and your heart working. A recent study showed that people who run have 25 to 40 per cent reduced risk of early death, and live about three years longer. Get more sun - but not too much The “sunshine vitamin” – vitamin D, that is – has been shown to fight to disease, improve bone health, and prevent depression. Concerns over skin cancer are well-founded, and sunblock is generally a good idea. But getting 15 to 30 minutes of sun exposure a day should be adequate for vitamin D production. Stress less The impact of stress on our overall health is huge, so reducing stress is one way to lower our risk of many deadly diseases. Eat more fruits and veggies If you want to live longer, eat more fruits and vegetables. The vitamins, minerals, and most importantly, the fibre help control satiety so you do not need to eat much of the animal foods. High fibre diets promote lower cholesterol levels, and reduce the risk of heart disease and cancers such as colon cancer. 1. One of the most important things you can do to stay healthy is to exercise. 2. Vitamin D comes from the sun. 3. Getting too much sun can be harmful. 4. Stress doesn’t impact on your health. 5. Fruits and vegetables contain vitamins, minerals and fibre. 6. A high fibre diet can cause heart disease and colon cancer.

Cho đường tròn tâm O. Từ điểm M nằm ngoài đường tròn, vẽ hai tiếp tuyến ME và MF sao cho góc EMO bằng 30 độ. Biết chu vi tam giác MEF là 30 cm. Tính: a) Độ dài EF b) Diện tích tam giác MEF

Chuyển câu sau sang câu bị động He expected us to offer his sister the job => He expected......

Phân tích thành nhân tử : 1 , (a+b+c)(ab+bc+ca)-abc 2, 4a(a+b)(a+b+c)(a+c)+b2c2 3, a(b2+c2)+b(c2+a2)+c(a2+b2)+3abc 4, ab(a+b)-bc(b+c)-ca(c-a)

Viết lại câu văn sau sao cho nghĩa không thay đổi, sử dụng từ gợi ý trong ngoặc. I like watching movies. I like seeing plays, too. (not only...but also...)

a , (2x-15) ^5=(2x-15) ^2 b,(2+x) +(4+x) +(6+x) +......+(52+x)=780 x thuộc N nhé

sap xep cau go/you/restaurant / often/a/do/how/to?