a)-2/7+2/7:3/5

-2/7+(2/7:3/5)

-2/7+10/21

42/147+70/147

102/147

b)-8/19+-4/21-17/21+27/19

(8/19+27/19)-(-4/21+17/21)

35/19-1

35/19

c)6/5 . 3/13-6/5 . 16/13

18/65-6/5 . 16/13

18/65-96.65

-6/5

a)-2/7+2/7:3/5

-2/7+(2/7:3/5)

-2/7+10/21

42/147+70/147

102/147

b)-8/19+-4/21-17/21+27/19

(8/19+27/19)-(-4/21+17/21)

35/19-1

35/19

c)6/5 . 3/13-6/5 . 16/13

18/65-6/5 . 16/13

18/65-96.65

-6/5

a)-2/7+2/7:3/5

-2/7+(2/7:3/5)

-2/7+10/21

42/147+70/147

102/147

b)-8/19+-4/21-17/21+27/19

(8/19+27/19)-(-4/21+17/21)

35/19-1

35/19

c)6/5 . 3/13-6/5 . 16/13

18/65-6/5 . 16/13

18/65-96.65

-6/5

a)-2/7+2/7:3/5

-2/7+(2/7:3/5)

-2/7+10/21

42/147+70/147

102/147

b)-8/19+-4/21-17/21+27/19

(8/19+27/19)-(-4/21+17/21)

35/19-1

35/19

c)6/5 . 3/13-6/5 . 16/13

18/65-6/5 . 16/13

18/65-96.65

-6/5

a)-2/7+2/7:3/5

-2/7+(2/7:3/5)

-2/7+10/21

42/147+70/147

102/147

b)-8/19+-4/21-17/21+27/19

(8/19+27/19)-(-4/21+17/21)

35/19-1

35/19

c)6/5 . 3/13-6/5 . 16/13

18/65-6/5 . 16/13

18/65-96.65

-6/5

a) \(\frac{- 2}{7}+\frac{2}{7}:\frac{3}{5}=-\frac27+\left(\frac27.\frac53\right)=-\frac27+\frac{10}{21}=-\frac{14}{21}+\frac{10}{21}=\frac{-4}{21}\)

b) \(\frac{- 8}{19}+\frac{- 4}{21}-\frac{17}{21}+\frac{27}{19}=\left(-\frac{8}{19}+\frac{27}{19}\right)+\left(-\frac{4}{21}+\frac{-17}{21}\right)=\frac{19}{19}+\frac{-21}{21}=1-1=0\)

c) \(\frac{6}{5}.\frac{3}{13}-\frac{6}{5}.\frac{16}{13}=\frac65^{}.\left(\frac{3}{13}-\frac{16}{13}\right)=\frac65.\frac{-13}{13}=-\frac65.1=-\frac65\)