She often cleans her room every weekends.

I live in Paris since 1972.

a) There are four peoples in my family.

b) His grandfather is 78 yeasr old.

c) Is Lan your student?

d) Is there a picture on the wall in  your living room?

in

listened

shi is going to play football next weekend.

there are some pictures on the wall

đáp án = 931 

b) -7/31+(24/17+3/31) = -7/31+24/17+7/31= (-7/31+7/31)+24/17= 0+24/17=24/17

c) 3/7+(-1/5+-3/7)= 3/7+-1/5+-3/7= ( 3/7+-3/7)+-1/5= 0+-1/5 = -1/5