a) Tính:
\(\dfrac{4}{9}:\dfrac{2}{3}=.................\)
\(=..................\)
\(3:\dfrac{4}{5}=.................\)
\(=.................\)
\(\dfrac{4}{5}:3=.................\)
\(=.................\)
b) Tính bằng cách thuận tiện nhất :
\(\dfrac{1}{2}:\dfrac{7}{8}+\dfrac{3}{2}:\dfrac{7}{8}=....................\)
\(=.....................\)
...
Đọc tiếp
a) Tính:
\(\dfrac{4}{9}:\dfrac{2}{3}=.................\)
\(=..................\)
\(3:\dfrac{4}{5}=.................\)
\(=.................\)
\(\dfrac{4}{5}:3=.................\)
\(=.................\)
b) Tính bằng cách thuận tiện nhất :
\(\dfrac{1}{2}:\dfrac{7}{8}+\dfrac{3}{2}:\dfrac{7}{8}=....................\)
\(=.....................\)
\(=.....................\)
\(\dfrac{4}{3}:\dfrac{7}{8}-\dfrac{1}{3}:\dfrac{7}{8}=.....................\)
\(=.....................\)
\(=.....................\)
a, Tính
4/9 : 2/3 = 4/9 x 3/2 = 2/3
3 : 4/5 = 15/4
4/5 : 3 = 5/15
b, 1/2 : 7/8 + 3/2 : 7/8
= 1/2 x 8/7 + 3/2 x 8/7
= 8/7 x ( 1/2 + 3/2 )
= 8/7 x 2
= 16/7
4/3 : 7/8 - 1/3 : 7/8
= 4/3 x 8/7 - 1/3 x 8/7
= 8/7 x ( 4/3 - 1/3 )
= 8/7 x 1
= 8/7
a) \(\dfrac{4}{9}:\dfrac{2}{3}=\dfrac{4}{9}\times\dfrac{3}{2}=\dfrac{2}{3}\)
\(3:\dfrac{4}{5}=3\times\dfrac{5}{4}=\dfrac{15}{4}\)
\(\dfrac{4}{5}:3=\dfrac{4}{5}\times\dfrac{1}{3}=\dfrac{4}{15}\)
b) \(\dfrac{1}{2}:\dfrac{7}{8}+\dfrac{3}{2}:\dfrac{7}{8}=\dfrac{1}{2}\times\dfrac{8}{7}+\dfrac{3}{2}\times\dfrac{8}{7}=\left(\dfrac{1}{2}+\dfrac{3}{2}\right)\times\dfrac{8}{7}=2\times\dfrac{8}{7}=\dfrac{16}{7}\)
\(\dfrac{4}{3}:\dfrac{7}{8}-\dfrac{1}{3}:\dfrac{7}{8}=\dfrac{4}{3}\times\dfrac{8}{7}-\dfrac{1}{3}\times\dfrac{8}{7}=\left(\dfrac{4}{3}-\dfrac{1}{3}\right)\times\dfrac{8}{7}=1\times\dfrac{8}{7}=\dfrac{8}{7}\)