giong the

còn lại số cây soài là;

12-3=4(cây)

1.It is the first time I have met him there.

2.It was at the age of 14 that Jack London left school and became a sailor.

3.The video film was so interesting that I have seen it twice

4.It was the first time they have ever met.

5.The news was quite alarming yesterday.

6.We haven't lived in England for two years now.

7.I will never forget what you have just told me.

8.They are preparing the Christmas dinner at the moment.

9.When i last stayed in Cairo, I rode to the Pyramids on a camel that my friends borrowed the day before.

10.Our teacher told us yesterday that he visited England in 1970.

3 - 4 = -11 Nhiệt độ hôm nay ở Sa Pa là -1 độ C.

Đổi:20%=0,2

Ta có:S hình vuông lúc đầu:a x a

         S hình vuông sau khi tăng:(a x 0,2) x (a x 0,2)=a x 0,2 x a x 0,2=a x a x 0,04

Vậy S hình vuông tăng 0,04 khi cạnh hình vuông tăng 20%