A

Miến

a) Cửa hàng đã thực hiện được : 

15 : 12 x 100% = 125%

b) Cửa hàng đã vượt mức :

125% - 100% = 25%

21mm² = 0,021m² 

17cm² = 170mm² 

2100mm² = 210m²  

347dm² = 3470cm² 

1/4 ha = 25m² 

1/100 ha = 1m² 

2m² 12cm² = 12,02cm²

2/5km² = 40ha

S,S,S,Đ,S,Đ

He watched TV yesterday

I played football last night

I was reading a book at 5 p.m yesterday

My mother was mopping the floor

They have to make their bed every day

He has to walk with his dog

She had to do her homework last weekend

I had to wash the dishes last Monday

0,05 = 0,050

7,8 =7,800

100,5 =100,500

30,07 =30,070

 131,04 =131,040