Question

4/5+2/3

5/7-4/9

7/13*4/5

4/9:4/8

Answer 1

a: =12/15+10/15=22/15

b: =45/63-28/63=17/63

c: =28/65

d: =4/9x8/4=32/36=8/9

Answer 2

\(a,\dfrac{4}{5}+\dfrac{2}{3}=\dfrac{4.3+2.5}{15}=\dfrac{22}{15}\\ b,=\dfrac{5}{7}-\dfrac{4}{9}=\dfrac{5.9-4.7}{63}=\dfrac{17}{63}\\ c,=\dfrac{7.4}{13.5}=\dfrac{28}{65}\\ c,=\dfrac{4}{9}.\dfrac{8}{4}=\dfrac{8}{9}\)

Answer 3

\(\dfrac{4}{5}+\dfrac{2}{3}=\dfrac{12}{15}+\dfrac{10}{15}=\dfrac{12+10}{15}=\dfrac{22}{15}\)

\(\dfrac{5}{7}-\dfrac{4}{9}=\dfrac{45}{63}-\dfrac{28}{63}=\dfrac{45-28}{63}=\dfrac{17}{63}\)

\(\dfrac{7}{13}\times\dfrac{4}{5}=\dfrac{7\times4}{13\times5}=\dfrac{28}{65}\)

\(\dfrac{4}{9}:\dfrac{4}{8}=\dfrac{4\times8}{4\times9}=\dfrac{8}{9}\)

Answer 4

\(\dfrac{4}{5}+\dfrac{2}{3}=\dfrac{12}{15}+\dfrac{10}{15}=\dfrac{22}{15}\)

\(\dfrac{5}{7}-\dfrac{4}{9}=\dfrac{45}{63}-\dfrac{28}{63}=\dfrac{17}{63}\)

\(\dfrac{7}{13}x\dfrac{4}{5}\)=\(\dfrac{28}{65}\)

Answer 5

`4/5+2/3=12/15 + 10/15= 22/15`

`5/7-4/9=45/63- 28/63=17/63`

`7/13xx4/5=28/65`

`4/9:4/8=4/9 xx 8/4= 32/36=8/9`