1. Should we meet at 9:30, we.....(have) plenty of time.

2. Lisa would find the milk if she.....

(look) in the fridge.

3. The zookeeper would punish her with a fine if she.....(feed) the animal in the zoo.

4. If you spoke louder, your classmates.....(understand) you.

5. Dat.....(arrive) safe if he drove slowly.

6. Chien.....(have) no trouble at school if you dial your homework.

7. If he ..... (swim) in this lake, you'll shiver from cold.

8. The door will unlock if you.....(press) the green button.

9. If Mel asked her teacher, he......(have) right question.

10. I.....(call) the office if I was/were you.

11. If we.....(send) an invitation, our friends would come to our party.

12. He.....(not/to understand) you if you didn't talk him.

13. They.....(not/to survive) in the desert if they didn't take extra water with them.

x² - 17x - 60

Phân tích đa thức thành nhân tử

4x² - y² +4x + 1

Phân tích đa thức thành nhân tử

Rút gọn biểu thức :

a) (x+5)(x-5)-(x²-1)

b) (4x+1)²+(4x-1)²-2(4x-1)(4x+1)

Mình ko biết rút gọn, giúp mình nha.