Diện tích là;
    105 x 60 = 6300(m2)

1.I just ..have just finished.. (finish) my homework.

2.They..have lived.. (live) in the countryside for 15 years.

3.You ever ..Have you ever been..(be) to Hue Citadel ?

4.I ..haven't seen.. (not) see her for ages.

5.This the highest hotel that i ever.. have ever seen ..(see).

6.A lot of people ..have become.. (become) rich recently.

7.I ..haven't understood..(not/understand) his lesson so far.

GOOD LUCK !!

\(\frac{9}{3}.\frac{6}{7}+\frac{9}{3}.\frac{3}{3}\)

= \(\frac{9}{3}.\left(\frac{6}{7}+\frac{3}{3}\right)\)

= \(\frac{9}{3}.\frac{13}{7}\)

= \(\frac{39}{7}\)