I/go/ Ha Long Bay / family/ last week

=> I went to Ha Long Bay with my family last week.

We / go / there/ car

=> We went there by car.

We/stay/three day

=> We stayed here three days.

We / visit / a lot / beautiful caves

=> We visited a lot of beautiful caves.

It / be / interesting holiday/ I / have / geart time

=> It was an interesting holiday and I had a great time.

28 học trò nhé

5; How many => much milk would you like?

Q(y) = y⁴ + 2

Ta có: y⁴ có giá trị lớn hơn hoặc bằng 0 với mọi y

Nên y⁴ + 2 có giá trị lớn hơn 0 với mọi y

Tức là Q(y) ≠ 0 với mọi y

Vậy Q(y) không có nghiệm