1/4+5/4 ; 5/2+-7/2 ; 2/3+5/3 ; -8/7+-6/7; 7/6+-11/6 ; -3/-7+4/-7 ; -7/3+-10/3 ; 9/4+-11+/-4 ; 7/-5+-9/5 ; 12/-13+-9/13 ; 1/-3 +-5/3 ; -5/4- (-7) /4 ; 4/5-3/-5;. 7/-9 – 13/9. ; 23/(-11) – (-3)/(-11);
23/9 – (-17)/9 ; 9/8-(-11)/8 ; -1/2-5/2 ; 4/3-7/3
3/(-5) – (-8)/10 ; 5/7- (-3)/21 ; 4/(-3) – 9/27 ; 7/29 – 9/29 ; -7/22 – 9/22; -23/7 – 31/7
Ghi rõ cách làm nha , giúp mềnh vs ạ ????
Đáp án:
Giải thích các bước giải:
$\frac{1}{4}+\frac{5}{4}=\frac{3}{2}\\\frac{5}{2}+(-\frac{7}{2})\\=-1\\\frac{2}{3}+\frac{5}{3}=\frac{7}{3}\\-\frac{8}{7}+(-\frac{6}{7})=-2\\\frac{7}{6}+(-\frac{11}{6})=-\frac{2}{3}\\\frac{-3}{-7}+\frac{4}{-7}=-\frac{1}{7}\\-\frac{7}{3}+(-\frac{10}{3})=-\frac{17}{3}\\\frac{9}{4}-\frac{11}{-4}=5\\\frac{7}{-5}+(-\frac{9}{5})=-\frac{16}{5}\\\frac{12}{-13}+(-\frac{9}{13})=-\frac{21}{13}\\\frac{1}{-3}+(-\frac{5}{3})=-2\\-\frac{5}{4}-\frac{-7}{4}=\frac{1}{2}\\\frac{4}{5}-\frac{3}{-5}=\frac{7}{5}\\\frac{7}{-9}-\frac{13}{9}=-\frac{20}{9}\\\frac{23}{-11}-\frac{-3}{-11}=-\frac{26}{11}\\\frac{23}{9}-\frac{-17}{9}=\frac{40}{9}\\\frac{9}{8}-\frac{-11}{8}=\frac{5}{2}\\-\frac{1}{2}-\frac{5}{2}=-3\\\frac{4}{3}-\frac{7}{3}=-1\\\frac{3}{-5}-\frac{-8}{10}=\frac{1}{5}\\\frac{5}{7}-\frac{-3}{21}=\frac{6}{7}\\\frac{4}{-3}-\frac{9}{27}=-\frac{5}{3}\\\frac{7}{29}-\frac{9}{29}=-\frac{2}{29}\\-\frac{7}{22}-\frac{9}{22}=-\frac{8}{11}\\-\frac{23}{7}-\frac{31}{7}=-\frac{54}{7}$
1/4+5/4=3/2
5/2+-7/2=-1
2/3+5/3 =7/3
-8/7+-6/7=-2
7/6+-11/6=-2/3
-3/-7+4/-7=-1
-7/3+-10/3=-17/3
9/4+-11+/-4
7/-5+-9/5 =-16/5
12/-13+-9/13=-21/13
1/-3 +-5/3=-2
-5/4- (-7) /4 ; 4/5-3/-5;. 7/-9 – 13/9. ; 23/(-11) – (-3)/(-11); 23/9 – (-17)/9 ; 9/8-(-11)/8 ; -1/2-5/2 ; 4/3-7/3 3/(-5) – (-8)/10 ; 5/7- (-3)/21 ; 4/(-3) – 9/27 ; 7/29 – 9/29 ; -7/22 – 9/22; -23/7 – 31/7