Question

Trong một cuộc thi làm tranh giấy, đội Quê Hương đã làm một bức tranh hình chữ nhật có chu vi là 16,8m và chiều dài hơn chiều rộng 3,2m. Để làm được 1 m2 tranh thì cần 0,75kg giấy màu . Vì vậy , sau khi hoàn thành bức tranh , đội Quê Hương đã dung hết bao nhiêu kg giấy màu?

Answer 1

Nữa chu vi bức tranh :

 16,8 : 2 = 8,4 ( m )

Chiều dài bức tranh :

 ( 8,4 + 3,2 ) : 2 = 5,8 ( m )

Chiều rộng bức tranh :

5,8 - 3,2 = 2,6 ( m )

Diện tích bức tranh :

5,8 x 2,6 = 15,08 ( m² )

Dùng hết số giấy màu :

15,08 : 1 x 0,75 = 11,31 ( kg )

đ/s : 11,31 kg 

Answer 2

11,31 là đúng đấy 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Answer 3

tìm n để phân số 3n+2/ 7n+1 tối giản