Cho A=\(\frac{3n-5}{n+4}\).Tìm ∈ Z để A có giá trị nguyên.

Cho 10 ô liên tiếp

...;-5;...;...;...;...;-9;...;...;...

Hãy điền vào ô trống sao cho tổng 3 ô liền nhau bằng 0

Tìm x ∈ Z,biết.

a)\(\frac{111}{37}< x< \frac{91}{13}\)

b)\(\frac{-84}{14}< 3x< \frac{108}{9}\)

Viết 5 số nguyên vào 5 đỉnh của một ngôi sao 5 cánh sao cho 2 số tại 2 đỉnh liền nhau luôn bằng -6.Tìm 5 số nguyên đó.

Rewrite the sentences below,using the present perfect.

1.They (never eat)..........Mexican food.

2.Hoa (wolk)...........in the rain many times.She loves it.

3.I (never see)............ such a big flower.

4.We (not visit).............. Nha Trang

5.I (read)...........that novel three times.

6.He(never meet)............ her before.

7.The zoo isn't far from here.I (walk)...........there three times.

8.If we (not economise)...........on electricity there will be power cuts.

9.I hope he (finish).........his homework before we (get).........back.

10.If we sit too far away from the screen I (no be)............. able to see the film.

11.listen to those people!What language they (speak)..............

12.Where you (come).......... from in finland?

-I (come)............. from Helinki.But I (not live) ...................There since I was ten years old.

13.look at the sky!.It (rain)............