2 5/7+(-1 1/3)= 2 5/7-1 1/3=19/7-4/3=57/21-28/21=29/21=1 7/21=1 3/7 (-3 6/7)+(-2 4/5)=-27/7-14/5=-135/35-98/35=-233/35=-6 23/35 (-5 1/3)+2 4/7=-16/3+18/7=-112/21+54/21=-58/21=-2 16/21 (-3 4/5)+2 1/2=-19/5+5/2=-38/10+25/10=-13/10=-1 3/10 (-2 1/7)-5 3/4=-15/7-23/4=-60/28-161/28=-221/28=-7 25/28 2 5/7+(-3 1/4)=19/7-13/4=76/28-91/28=-15/28
a.) [latex]2frac{5}{7}+(-1frac{1}{3})=2frac{15}{21}-1frac{7}{21}=1frac{8}{21}[/latex] b.)Tu odrazy sprowadzam do wspólnego mianownika [latex]-3frac{30}{35}-2frac{28}{35}=-6frac{23}{35}[/latex] c.) [latex]-5frac{7}{21}+2frac{12}{21}=-2frac{16}{21}[/latex] d.) [latex]-3frac{8}{10}+2frac{5}{10}=1frac{3}{10}[/latex] e.) [latex]-2frac{4}{28}-5frac{21}{28}=-7frac{25}{28}[/latex] f.) [latex]2frac{20}{28}-3frac{7}{28}=-frac{15}{28}[/latex]
