Question

Tính nhanh: 21/11 x 22/17 : 42/34

Answer 1

\(=\dfrac{21}{11}\cdot\dfrac{22}{17}\cdot\dfrac{34}{42}=\dfrac{1}{2}\cdot2\cdot2=2\)

Answer 2

21/11 x 22/17 : 42/34

=     41/17  : 42/34

=             41/21