B = \(\frac{-6x-9}{7x-5}\) ∈ Z ⇔ (-6\(x-9\)) ⋮ (7\(x-5\))

7.(-6\(x-9\)) ⋮ (7\(x-5\))

[-6.(7\(x\) - 5) - 93) ⋮ (7\(x-5\))

93 ⋮ (7\(x\) - 5)

(7\(x\) - 5) ∈ Ư(93) = {-93; -1; 1; 93)

Lập bảng ta có:

Theo bảng trên ta có: \(x=14\)

Vậy \(x=14\)

Phụ nữ ởZimbabwecó tuổi thọ trung bình thấp nhất thế giới, chỉ khoảng 34 tuổi. Các quốc gia khác như Sierra Leone, Chad, Lesotho và Nigeria cũng có tuổi thọ trung bình thấp, đặc biệt là ở các khu vực nghèo khó và bất ổn chính trị. 

Phụ nữ ởZimbabwecó tuổi thọ trung bình thấp nhất thế giới, chỉ khoảng 34 tuổi. Các quốc gia khác như Sierra Leone, Chad, Lesotho và Nigeria cũng có tuổi thọ trung bình thấp, đặc biệt là ở các khu vực nghèo khó và bất ổn chính trị. 

\(\left(\frac14\right)^{31}=\left\lbrack\left(\frac12\right)^2\right\rbrack^{31}=\left(0,5\right)^{2\cdot31}=\left(0,5\right)^{62}\)

Sao lớn nhất từng được quan sát thấy trong vũ trụ làBernardinelli-Bernstein, còn được gọi là C/2014 UN271. Nó có kích thước ước tính khoảng 129 km, lớn hơn cả Rhode Island của Mỹ, theo NASA. 

\(\frac{x}{15}=\frac{8}{21}\)

=>\(x.21=8.15\)

=>\(x.21=120\)

=>\(x\) = 120 : 21

=>\(x\) = \(\frac{40}{7}\)

Vậy \(x=\frac{40}{7}\)

\(\frac{x}{15}=\frac{8}{21}\)

\(\Rightarrow21x=15\cdot8\)

\(21x=120\)

\(x=120:21\)

\(x=\frac{120}{21}=\frac{40}{7}\)

Vậy \(x=\frac{40}{7}\)

1. A

2. C

1 A

2 C

Olm chào em, cảm ơn đánh giá của em về chất lượng bài giảng của Olm, cảm ơn em đã đồng hành cùng Olm trên hành trình tri thức. Chúc em học tập hiệu quả và vui vẻ cùng Olm em nhé!

Ta có: \(16+\left(27-7\cdot6\right)-99\cdot7-27\cdot99\)

\(=16+27\left(1-99\right)-7\left(6+99\right)\)

\(=16+27\cdot\left(-98\right)-7\cdot105=-3365\)

\(16 + \left(\right. 27 - 7 \cdot 6 \left.\right) - 99 \cdot 7 - 27 \cdot 99\)

\(= 16 + 27 \left(\right. 1 - 99 \left.\right) - 7 \left(\right. 6 + 99 \left.\right)\)

\(= 16 + 27 \cdot \left(\right. - 98 \left.\right) - 7 \cdot 105 = - 3365\)
Chúc bạn ngày mới vui vẻ

I. Rewrite the following sentences without changing meaning ( 2 cách )

1. It is expected that the strike will end soon.

→ The strike is expected to end soon.

⇒ People expect that the strike will end soon.

2. It is thought that the prisoner escaped by climbing over the wall.

→ The prisoner is thought to have escaped by climbing over the wall.

⇒ People think that the prisoner escaped by climbing over the wall.

3. It is reported that many people are homeless after the floods.

→ Many people are reported to be homeless after the floods.

⇒ People report that many people are homeless after the floods.

II. Rewrite the following sentences without changing meaning (1 cách )

1. I have Lan buy some food.
→ Lan buys some food for me.

2. They got me carry these tables in the room.

→ They made me carry these tables in the room.

3. She had her repair his bike.       

→ She got her to repair his bike.

4. He saw her work hard.

→ He was seen to work hard by him.

5. They need to repair his bike.

→ His bike needs to be repaired.

6. She will get me to replant the trees next week.

→ She will have me replant the trees next week.

7. They get her redo her test.

→ They make her redo her test.

1.it is expected that the strike will end soon

=> The strike is expected to end soon

=> People expect that the strike will end soon 2.it is thought that the prisoner escaped by climbing over the wall

=> The prisoner is thought to have escaped by climbing over the wall

=> People think that the prisoner escaped by climbing over the wall 3.it is reported that many people are homeless aftẻ the floods

=> Many people are reported to be homeless after the floods

=> They report that many people are homeless after the floods

Usually, I wake up early and go to school. After classes, I often do my homework and sometimes help my family with chores. In my free time, I like to listen to music or play sports with my friends. Right now, I am sitting at my desk, working on my English homework. I am trying to write clearly and complete the task well.