Một đội công nhân sửa quãng đường trong 3 ngày ngày thứ nhất đội sửa được 1/4 quãng đường ngày thứ hai sửa được 2/5 quãng đường đó ngày thứ ba đội sửa được 14 m đường hỏi quãng đường đó dài bao nhiêu mét

Giúp mình câu 3 với mng........

Mong đc trả lời ...................

Cho tam giác ABH =12 cm và chu vi tam giác ACH = 16 cm.Tính chu vi tam giác ABC

Cho tam giác ABC, vẽ ra phía ngoài của tam giác 2 tam giác vuông cân ABD và ACE( ABD=ACE=$90^{o}$ ) vẽ đường cao AH (H thuộc BC). CMR 3 đường thẳng AH;BE;CD cùng đi qua một điểm

bài 1 : cho 2 đa thức P( x ) = x^5 - 3x^2 + 7x^4 - 9x^3 + x^2 - 1/4 x Q( x ) = 5x^4 -x^5 + x^2 - 2x^3 + 3x^2 - 1/4 a ) sắp xếp theo lũy thừa giảm dần của biến b) tính M ( x) = P ( x) + Q( x ) H (x) = P(x) - Q(x) c ) CMR x = 0 là nghiệm của P ( x ) , ko là nghiệm của Q(x)

EXERCISE: Complete each of the following sentences with a phrasal verb from the box -contributed to -cool off -count him out -count on -cried out -cross out -crying out -cut down -cut off -decided against -depends on -described as -deterred -devoted -die down -disposes of -dying for -dying out -let you down 1. Many factors …………………….. the government's defeat, including increasing crime rates, rising prices and unemployment. 2. If you get angry, stop, count to ten, and try to cool off before you say anything. 3. You can …………………….. John. He's very reliable, so if he says he'll have it done on time, it'll definitely be done on time. 4. Bob said to …………………….. if we're booking a table for dinner. He's too busy. 5. Check the guest list and …………………….. the names of all the people who didn't come. 6. Matt …………………….. in fear when a big, black spider fell on his face. 7. Our apartment is …………………….. for some new furniture. What we've got looks old-fashioned and worn out. 8. If you're overweight, it's time to cut down on the amount of fatty food, junk food and snack foods that you eat. 9. They lived on a small island in the Pacific Ocean, …………………….. from the rest of the world. 10. After thinking about it for a while, I …………………….. quitting my job and starting my own company. If it failed, I'd lose everything. 11. I'm still not sure if we can play tennis today. It …………………….. the weather. 12. You can depend on Jill to do a good job. She's very reliable and I'm sure she won't …………………….. . 13. The man was …………………….. tall and dark, and aged about 20. 14. The number of spectators at the golf tournament was down today. The rain must have …………………….. many people from coming to watch. 15. Princess Diana …………………….. most of her time to helping people in need. 16. The controversy about the president's mistake took a long time to …………………….. . People were still talking about it a year later. 17. I'm …………………….. a cup of coffee. Would you mind ordering one for me? 18. If someone …………………….. a cigarette by throwing it on the ground, they can be fined up to $500. 19. Many languages are …………………….. because fewer and fewer people are learning them and speaking them.

A) to live b)living c)live d)lives

bộ phận nào trong cây là quan trọng nhất vì sao ?

Đo góc bẹt AOB, trên nửa mặt phẳng bờ AB vẽ các tia OC, OD sao cho góc AOC= 60 độ, góc BOD= 1/2 góc AOC. Chứng tỏ tia OC vuông góc với tia OD.....Giúp mình vớiiii