21/4x32/5=168/5
21/5:11/3=63/55
a)\(2\frac{1}{4}\times3\frac{2}{5}\)
\(=\frac{9}{4}\times\frac{17}{5}\)
\(=\frac{153}{20}\)
b)\(2\frac{1}{5}:1\frac{1}{3}\)
\(=\frac{11}{5}:\frac{4}{3}\)
\(=\frac{11}{5}\times\frac{3}{4}\)
\(=\frac{33}{20}\)
Cứ thấy có vấn đề...
Linz
\(2\frac{1}{4}\times3\frac{2}{5}=\frac{9}{4}\times\frac{17}{5}=\frac{9\times17}{4\times5}=\frac{153}{20}\)
Hok Tốt !!!!!!!!!!!!!!!!!!!!
sorry mik ko cố ý nhưng nó là hỗn số
Bài giải
\(a\text{)}2\frac{1}{4}\times3\frac{2}{5}\)
\(=\frac{9}{4}\times\frac{17}{5}\)
\(=\frac{153}{20}\)
\(b\text{)}2\frac{1}{5}\div1\frac{1}{3}\)
\(=\frac{11}{5}\div\frac{4}{3}\)
\(=\frac{11}{5}\times\frac{3}{4}\)
\(=\frac{33}{20}\)
