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\(a,8\frac{3}{4}+4\frac{1}{5}-3\frac{3}{4}\)
\(b,3\frac{1}{2}:\frac{1}{2}+3\frac{1}{2}:\frac{1}{4}\)
\(=\frac{35}{4}+\frac{21}{5}-\frac{15}{4}\)
\(=\frac{175+84-75}{20}\)
\(=\frac{184}{20}=\frac{46}{5}\)
\(b,3\frac{1}{2}\div\frac{1}{2}+3\frac{1}{2}\div\frac{1}{4}\)
\(=\frac{7}{2}\div\frac{1}{2}+\frac{7}{2}\div\frac{1}{4}\)
\(=\frac{7}{2}\div\left(\frac{1}{2}+\frac{1}{4}\right)\)
\(=\frac{7}{2}\div\frac{3}{4}\)
\(=\frac{7}{2}\times\frac{4}{3}\)
\(=\frac{14}{3}\)
\(a,8\frac{3}{4}+4\frac{1}{5}-3\frac{3}{4}\)
\(=\frac{35}{4}+\frac{21}{5}-\frac{15}{4}\)
\(=\frac{175+84-75}{20}\)
\(=\frac{184}{20}=\frac{46}{5}\)
\(b,3\frac{1}{2}\div\frac{1}{2}+3\frac{1}{2}\div\frac{1}{4}\)
\(=\frac{7}{2}\div\frac{1}{2}+\frac{7}{2}\div\frac{1}{4}\)
\(=\frac{7}{2}\div\left(\frac{1}{2}+\frac{1}{4}\right)\)
\(=\frac{7}{2}\div\frac{3}{4}\)
\(=\frac{7}{2}\times\frac{4}{3}\)
\(=\frac{14}{3}\)