Question

[Phuong Nguyen]

tính

34/15 nhân 3/17

3/19 chia 6/57

3/16 cộng 14/32

9/21 trừ 2/7

Answer 1

[456]

34/15 x 3/17

= 2/5 x 1

= 2/5

3/19 : 6/57

= 3/19 x 57/6

= 1/19 x 57/2

= 57/38

3/16 + 14/32

= 3/16 + 7/16

= 10/16 = 5/8

9/21 - 2/7

= 3/7 - 2/7

= 1/7

Answer 2

[Võ Ngọc Phương]

\(\dfrac{34}{15}\times\dfrac{3}{17}=\dfrac{34\times3}{15\times17}=\dfrac{2}{5}\)

\(\dfrac{3}{19}:\dfrac{6}{57}=\dfrac{3}{19}\times\dfrac{57}{6}=\dfrac{3\times57}{19\times6}=\dfrac{3}{2}\)

\(\dfrac{3}{16}+\dfrac{14}{32}=\dfrac{6}{32}+\dfrac{14}{32}=\dfrac{6+14}{32}=\dfrac{20}{32}=\dfrac{5}{8}\)

\(\dfrac{9}{21}-\dfrac{2}{7}=\dfrac{9}{21}-\dfrac{6}{21}=\dfrac{9-6}{21}=\dfrac{3}{21}=\dfrac{1}{7}\)

`#NqHahh`