67 dam2 51m2 = 67 dam2 +  m2 =  dam2
82 dam2 7m2 = 82dam2 +  m2 =  dam2

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a: \(6m^226dm^2=6.26m^2\)

\(8m^212m^2=20m^2\)

\(7m^28dm^2=7.08m^2\)

\(6m^229dm^2=6.29m^2\)

\(53dm^2=0.53m^2\)

TL ;

7 dam² 28 m² = 7,28 dam²

HT

Trl:

7dam² 28m² = 7,28dam²

HT

a) 7,28dam²

b) 95,5 dam²

c) 68,07 dam²

cảm ơn

6,28 dam2

25,7 dam2

64,05 dam2

Tao ngu lắm tao ko bt làm

có t i c h

Bài 5: 

Mỗi giờ vòi thứ nhất chảy được số phần bể là: 

\(1\div4=\frac{1}{4}\)(bể)

Mỗi giờ vòi thứ hai chảy được số phần bể là: 

\(1\div6=\frac{1}{6}\)(bể)

Khi hai vòi chảy chung mỗi giờ chảy được số phần bể là: 

\(\frac{1}{4}+\frac{1}{6}=\frac{5}{12}\)(bể) 

Khi hai vòi chảy chung sẽ chảy đầy bể sau số giờ là: 

\(1\div\frac{5}{12}=2,4\)(giờ) 

1,7 ak mk qên hết rồi, lâu rồi chưa hok lại hoặc 170

1700 đề ca mét vuông(1700 dam² )