Các cặp so le trong là: A4 - B1 - A3 - B2

Các cặp đồng vị là: A1 - B1 - 

a, (11/24 + 13/24) - (5/41 + 36/41) + 1/2

= 1 - 1 + 1/2

= 0 + 1/2

= 1/2

b, 1/2 . (3/4 + 1/4)

= 1/2 . 1

=1/2

c,

1. He ate something bad and his stomach hurt.

2. I don’t suggest organizing a talent show to raise money.

3. You should not eat junk food every day.

4. I prefer listening to country music more than classical music.

1. I drink a glass of milk before going to bed to help me sleep.

2.Volunteering at the food bank is a great way to help people in needs.

3.The dancer moved gracefully across the stage during the performance.

1. Let’s collect old textbooks and give them to children in mountainous areas.

2. My sister is fond of making vlogs about animals.

3. Last week, I had a sore throat, so I stayed home.