Question

[Bùi Quang Minh]

Tính nhanh

21/11*68/63*22/17

(27/25-4/9) - (2/25+5/9)

Answer 1

[Umi]

\(\frac{21}{11}\cdot\frac{68}{63}\cdot\frac{22}{17}\)

\(=1\cdot\frac{4}{3}\cdot2\)

\(=\frac{8}{3}\)

\(\left(\frac{27}{25}-\frac{4}{9}\right)-\left(\frac{2}{25}+\frac{5}{9}\right)\)

\(=\frac{27}{25}-\frac{4}{9}-\frac{2}{25}-\frac{5}{9}\)

\(=\left(\frac{27}{25}-\frac{2}{25}\right)-\left(\frac{4}{9}+\frac{5}{9}\right)\)

\(=1-1\)

\(=0\)