2 - 5/6= 7/6

7/8+3/4=`13/8

2/5+3/4=23/20

7/12 - 2/7 + 1/12=8/21

12/17 - 5/17 - 4/17=3/17

a)=7/6

b)=13/8

c)=8/21

d)=3/17

                  HẾT

\(2-\frac{5}{6}=1\frac{1}{6}\)

\(\frac{7}{8}+\frac{3}{4}=1\frac{5}{8}\)

\(\frac{2}{5}+\frac{3}{4}=\frac{23}{20}\)

\(\frac{7}{12}-\frac{2}{7}+\frac{1}{12}=\frac{8}{7}\)

\(\frac{12}{17}-\frac{5}{17}-\frac{4}{17}=\frac{3}{17}\)

bằng2527/3420

mik rut gọn rồi 

đúng thì

đúng thì k

nhâm -1596/3420

a)\(\frac{3}{17}\)

b)26

c)4

d)1,6

e)5,6

tk cho mik nhé

\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)

\(=\frac{4}{5}+\frac{11}{5}+\frac{1}{5}+\frac{2}{7}+\frac{12}{7}\)

\(=\frac{4+11+1}{5}+\frac{2+12}{7}\)

\(=\frac{16}{5}+\frac{14}{7}\)

\(=\frac{16}{5}+2=\frac{26}{5}\)

\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)

\(=\left(\frac{4}{5}+\frac{11}{5}+\frac{1}{5}\right)+\left(\frac{2}{7}+\frac{12}{7}\right)\)

\(=\frac{16}{5}+\frac{14}{7}\)

\(=\frac{16}{5}+2=\frac{16}{5}+\frac{10}{5}=\frac{26}{5}\)

\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)

\(=\left(\frac{4}{5}+\frac{11}{5}+\frac{1}{5}\right)+\left(\frac{2}{7}+\frac{12}{7}\right)\)

\(=\frac{16}{5}+2\)

\(=\frac{26}{5}\)

\(\dfrac{-3}{7}+\dfrac{15}{26}-\left(\dfrac{2}{13}-\dfrac{5}{17}\right)\)

\(=\dfrac{27}{182}+\dfrac{31}{221}\)

\(=\dfrac{893}{2094}\)

a, \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)

\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)

\(=1+\frac{3}{5}\)

\(=\frac{8}{5}\)

b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)

\(=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)\)

\(=\frac{3}{2}+2\)

\(=\frac{7}{2}\)

c, \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)

\(=2+\frac{3}{4}\)

\(=\frac{11}{4}\)

nhớ ấn đúng giùm tớ nha

a) = 8 phần 5

b) = 7 phần 2

c) = 11 phần 4

nhớ ấn giùm tớ nha

1/3 và 5/6 =2/6+5/6= 7/6

7/9 và 1/6 =7/3+1/3 =8/3

12/15 và 2/5=12/15 +6/15=18/15                              

k nhoa !!!!!!!