b) \(\frac{3}{5}:\frac{5}{6}:\frac{6}{7}:\frac{7}{8}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{3}{5}\times\frac{6}{5}:\frac{6}{7}:\frac{7}{8}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{18}{25}\times\frac{7}{6}:\frac{7}{8}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{21}{25}\times\frac{8}{7}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{24}{25}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{34}{25}+\frac{23}{35}\)

Chắc mình chỉ làm được đến đây thôi, đúng thì đúng, sai thì kệ

\(=\frac{3}{5}.\frac{6}{5}.\frac{7}{6}.\frac{8}{7}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{24}{25}+\frac{2}{5}+\frac{23}{35}\)

\(=\frac{34}{25}+\frac{23}{35}=\frac{353}{175}.\)

a ) \(5\frac{3}{4}:3+2\frac{1}{4}.\frac{1}{3}-\frac{3}{8}=\frac{23}{4}:\frac{3}{1}+\frac{9}{4}.\frac{1}{3}=\frac{23}{12}+\frac{3}{4}=\frac{8}{3}\)

b ) \(\frac{3}{5}:\frac{5}{6}:\frac{6}{7}:\frac{7}{8}+\frac{7}{8}+\frac{2}{5}+\frac{23}{35}=\frac{3.6.7.8}{5.5.6.7}+\frac{7}{8}+\frac{2}{5}+\frac{23}{35}=\frac{24}{25}+\frac{7}{8}+\frac{2}{5}+\frac{23}{35}=\frac{4049}{1400}\)

a) =  \(\frac{23}{4}:3+\frac{9}{4}x\frac{1}{3}-\frac{3}{8}\)

= ....

(bn tự giải nhé, mk đã làm thành phân số cho bn r`)

b) tương tự như câu a nhé

nha bn

\(\frac{5}{16}+\frac{5}{7}+0,4+\frac{1}{6}-\frac{4}{35}\)

= \(\frac{5}{16}+\frac{25}{35}+\frac{2}{5}+\frac{1}{6}-\frac{4}{35}\)

= \(\frac{5}{16}+\frac{2}{5}+\frac{1}{6}+\frac{25}{35}-\frac{4}{35}\)

= \(\frac{5}{16}+\frac{2}{5}+\frac{1}{6}+\frac{2}{3}\)

= \(\frac{5}{16}+\frac{2}{5}+\frac{5}{6}\)

= \(\frac{5}{16}+\frac{37}{30}\)

= \(\frac{371}{240}\)