a) $\frac{-7}{25}$ + $\frac{18}{-25}$ +$\frac{4}{23}$+ $\frac{5}{7}$ +$\frac{19}{23}$ = ($\frac{-7}{25}$ + $\frac{-18}{25}$ )+($\frac{4}{23}$ +$\frac{19}{23}$)+ $\frac{5}{7}$ =-1+1+ $\frac{5}{7}$ = $\frac{5}{7}$ b) $\frac{7}{19}$.$\frac{8}{11}$ +$\frac{7}{19}$.$\frac{3}{11}$+$\frac{12}{19}$ =$\frac{7}{19}$.($\frac{8}{11}$+$\frac{3}{11}$)+$\frac{12}{19}$ =$\frac{7}{19}$+$\frac{12}{19}$ =1 c)8$\frac{2}{7}$ -(3$\frac{4}{9}$+4 $\frac{2}{7}$ ) =(8$\frac{2}{7}$ -4 $\frac{2}{7}$ ) -3$\frac{4}{9}$ =4-3$\frac{4}{9}$ =$\frac{5}{9}$ d)$\frac{-7}{9}$.$\frac{8}{11}$ +$\frac{-7}{9}$.$\frac{3}{11}$+1$\frac{7}{9}$ =$\frac{-7}{9}$.($\frac{8}{11}$+$\frac{3}{11}$)+1$\frac{7}{9}$ =$\frac{-7}{9}$+1$\frac{}{9}$ =0 e)$\frac{7}{35}$.$\frac{10}{19}$ +$\frac{7}{35}$.$\frac{9}{19}$-$\frac{2}{35}$ =$\frac{7}{35}$.($\frac{10}{19}$+$\frac{9}{19}$)-$\frac{2}{35}$ =$\frac{7}{35}$-$\frac{5}{35}$ =$\frac{1}{7}$ f)(-25).125.4.(-8).(-17) =[(-25).4].[125.(-8)].(-17) =(-100).(-1000).(-17) =(-1700000) Reply
a) $\frac{-7}{25}$ + $\frac{18}{-25}$ +$\frac{4}{23}$+ $\frac{5}{7}$ +$\frac{19}{23}$
= ($\frac{-7}{25}$ + $\frac{-18}{25}$ )+($\frac{4}{23}$ +$\frac{19}{23}$)+ $\frac{5}{7}$
=-1+1+ $\frac{5}{7}$
= $\frac{5}{7}$
b) $\frac{7}{19}$.$\frac{8}{11}$ +$\frac{7}{19}$.$\frac{3}{11}$+$\frac{12}{19}$
=$\frac{7}{19}$.($\frac{8}{11}$+$\frac{3}{11}$)+$\frac{12}{19}$
=$\frac{7}{19}$+$\frac{12}{19}$
=1
c)8$\frac{2}{7}$ -(3$\frac{4}{9}$+4 $\frac{2}{7}$ )
=(8$\frac{2}{7}$ -4 $\frac{2}{7}$ ) -3$\frac{4}{9}$
=4-3$\frac{4}{9}$
=$\frac{5}{9}$
d)$\frac{-7}{9}$.$\frac{8}{11}$ +$\frac{-7}{9}$.$\frac{3}{11}$+1$\frac{7}{9}$
=$\frac{-7}{9}$.($\frac{8}{11}$+$\frac{3}{11}$)+1$\frac{7}{9}$
=$\frac{-7}{9}$+1$\frac{}{9}$
=0
e)$\frac{7}{35}$.$\frac{10}{19}$ +$\frac{7}{35}$.$\frac{9}{19}$-$\frac{2}{35}$
=$\frac{7}{35}$.($\frac{10}{19}$+$\frac{9}{19}$)-$\frac{2}{35}$
=$\frac{7}{35}$-$\frac{5}{35}$
=$\frac{1}{7}$
f)(-25).125.4.(-8).(-17)
=[(-25).4].[125.(-8)].(-17)
=(-100).(-1000).(-17)
=(-1700000)