Bài 1:
a: \(=\dfrac{24}{56}+\dfrac{35}{56}=\dfrac{59}{56}\)
b: \(=\dfrac{59}{56}-\dfrac{35}{56}=\dfrac{24}{56}=\dfrac{3}{7}\)
c: \(=\dfrac{15}{18}-\dfrac{8}{18}=\dfrac{7}{18}\)
d: \(=\dfrac{6}{12}+\dfrac{3}{12}+\dfrac{4}{12}=\dfrac{13}{12}\)
e: =3/5+30/5=33/5
Bài 2:
a, \(\dfrac{2}{3}x\dfrac{4}{5}x\dfrac{6}{7}=\dfrac{16}{35}\)
b, \(\dfrac{2}{7}x5=\dfrac{10}{7}\)
c, \(4x\dfrac{2}{9}=\dfrac{8}{9}\)
d, \(\dfrac{1}{3}:\dfrac{3}{4}=\dfrac{4}{9}\)
e, \(\dfrac{6}{7}:3=\dfrac{2}{7}\)
g, \(8:\dfrac{4}{5}=10\)
Bài 4:
\(a,2\dfrac{1}{3}+3\dfrac{1}{4}=\dfrac{7}{3}+\dfrac{13}{4}=\dfrac{28}{12}+\dfrac{39}{12}=\dfrac{67}{12}\)
\(b,4\dfrac{1}{4}-3\dfrac{2}{11}=\dfrac{17}{4}-\dfrac{35}{11}=\dfrac{187}{44}-\dfrac{140}{44}=\dfrac{47}{44}\)
\(c,6\dfrac{5}{9}+2\dfrac{5}{6}=\dfrac{59}{9}+\dfrac{17}{6}=\dfrac{118}{18}+\dfrac{51}{18}=\dfrac{169}{18}\)
\(d,7\dfrac{5}{9}-3\dfrac{5}{6}=\dfrac{68}{9}-\dfrac{23}{6}=\dfrac{136}{18}-\dfrac{69}{18}=\dfrac{67}{18}\)
\(e,3\dfrac{1}{5}x\dfrac{10}{11}+1\dfrac{2}{11}=\dfrac{16}{5}x\dfrac{10}{11}+\dfrac{13}{11}=\dfrac{32}{11}+\dfrac{13}{11}=\dfrac{45}{11}\)
\(g,5\dfrac{1}{3}:1\dfrac{2}{3}-1\dfrac{1}{5}=\dfrac{16}{3}:\dfrac{5}{3}-\dfrac{6}{5}=\dfrac{16}{3}x\dfrac{3}{5}-\dfrac{6}{5}=\dfrac{16}{5}-\dfrac{6}{5}=\dfrac{10}{5}=2\)
Bài 1:
g, \(\dfrac{13}{5}-2=\dfrac{13}{5}-\dfrac{10}{5}=\dfrac{3}{5}\)
