Question

[nguyễn lê bảo anh]

3:1/2=?

1/2:3=?

2.tính theo mẫu

a)9/10*5/6=9*5 10*6=3*3*5 5*2*3*2=3/4

b)6/25:21/20=

40/7*14/5=

17/13:51/26=

Answer 1

[Trần Kiều Thi]

1.1) 6

 1.2) 1/6
 

Answer 2

[Han Sara ft Tùng Maru]

\(3\div\frac{1}{2}=3\times\frac{2}{1}=6\)

\(\frac{1}{2}\div3=\frac{1}{2}\times\frac{1}{3}=\frac{1}{6}\)

2.Tính theo mẫu :

b) \(\frac{6}{25}\div\frac{21}{20}=\frac{6}{25}\times\frac{20}{21}=\frac{6\times20}{25\times21}=\frac{2\times3\times4\times5}{5\times5\times3\times7}=\frac{8}{35}\)

\(\frac{40}{7}\times\frac{14}{5}=\frac{40\times14}{7\times5}=\frac{5\times8\times7\times2}{7\times5}=16\)

\(\frac{17}{13}\div\frac{51}{26}=\frac{17}{13}\times\frac{26}{51}=\frac{17\times13\times2}{13\times17\times3}=\frac{2}{3}\)

Chúc bạn hok tốt !