32/80=4/10
72/400=18/100
425/5000=85/1000

chắc là C

hơi sai vị trí

Underline the correct preposition:

1. Don't sit in/ on/ under this stool. It's broken

2. My grandma is sitting in/ on/ at the armchair on/ next/ beside the fireplace

3. We live on/ in/ at an apartment on/ at/ into a very busy road

4. I put my book in/ on/ over the table in/ at/ on the dining room

5. Simon likes to stay in/ on/ at bed all Sunday morning

6. There is a clock under/ next to/ above the teacher's desk

7. He always hides the key on/ at/ under the doormat

8. Mary is sitting under/ between/ behind her parents. They are watching TV

9. On a bus, passengers sit in front of/ behind/ between theh driver

10. You can see children's books in/ on/ at the booksheft to/ at/ in the corner

mình lm rồi, tik đi(⊙ˍ⊙)

B3; mờ
B4:
a) (98-10):2+1=45(phần tử)
b) (70-10):3+1=21(Phần tử)

B2:
a) A={14;23;32;41;50}
b) B={18;24;42;81}

giúp j bạn ơi

👍(●'◡'●)

TIK MÌNH ĐI