Khối lượng chất rắn thu đuoc khi cho 3,45 gam kim loại Na tác dụng với 6,4 gam lưu huỳnh là

với giá trị nào của m thì phương trình (m-3)x² + (m+3)x-(m+1)=0 có hai nghiệm phân biệt?

giải kĩ hộ mình với ạ!

Một viên đạn có khối lượng m đang bay theo phương ngang với vận tốc v = 500m/s thì nổ thành 2 mảnh có khối lượng bằng nhau bay theo hai hướng vuông góc nhau, biết mảnh 1 bay chếch lên một góc 60 độ. Độ lớn vận tốc của mỗi mảnh là?

complete the sentences: 

musn't; needn't; don't have to; shouldn't; didn't have to; didn't need to; won't.

1. when i have something to do urgently tomorrow, i _____ (buy) cake for you.

2. Marry ----- (puy) for a babysister for Luke last night. Her parents looked after him at their house.

3. The Christmas holiday are little longer than usual this year. we ------ (go) back to school until January 10th.

4. Peter ----- (go) the hospital at the end. the doctor let him have two weeks off at home.

5. you------(worry) about your cats while you're away on holiday. we'll look after them for you.

6. i know i ------ (have) any more cream cakes, but it is my birthday after all.

7. you ----- (tell) anyone what i've just said. i'll be really angry if you do.

Fill each gap in the following sentences with a suitable word in the list.

degree; treat; discrimination; equality; enroll; gender; eliminate; housework; opportunity; force

1. Don't you believe in ______ between boys and girls?

2. There are good ______ for advancement if you have the right skills.

3. The single market is designed to ______ barries to the free movement of goods, services and people.

4. He showed great ______ in his choice of friends.

5. He had to leave the country through______of circumstance.

6. We _______ boys exactly the same as girl.

7. How much do men share ___________ and the care of his children?

8. Many factors are important, for example, class, _____, age and ethnicity.

9. The centre will soon be ready to ______ candidates for the new programme.

áp dụng BĐT côsi tìm gtln

\(2\sqrt{1-x}+x\left(x\le1\right)\)