giá bán của chiếc máy tính là :

                        15 750 000 :10% = 1575000

a 0,125 x 7,21 x 80                                   

= ( 0,125 x 80 ) x 7,21

= 10 x 7,21

=72,1

31,6 + 17, 92 = 49,52

315,7 - 12,23 = 303,47

3,6 x 4,1 = 14,76

32,4 : 4,5 = 73,2

63 tạ = 6,3 tấn

721mm = 0,721 m

9 km² 7 ha = 9,7 km²     

^{414 ml =  4,14 l}

1 my name is Quan i'm ten years old. i'm in class 5a3 at Bac Lenh primary school

2 i like colour a red 

3 my sister likes dress

4 my family and me go to the supermarket at the weekend 

5 i would like tobe a pilot, because very lots of money

1 she nationnality is VietNamese

2 his address at 47 queen street

3 he would like tobe a fightfire

4 he like cook

5 she do play the piano in her free time

My best friend name is Minh. Minh adress at 034 Phung Chi Kien street. He does play football weekend. He is  shorts hair  and shorts. He personality is very funny ,he is the student and he good learn math and science . he is  usualy help people in my class 

1/2

a 4 5/6

b 2 3/8

a, 8,071; 8,01; 7,801; 7,18

b, 7, 20