Question

[Quoc Tran Anh Le]

Tính:

a)\(\left( { - 3,5} \right).\left( {1\frac{3}{5}} \right);\)                   b) \(\frac{{ - 5}}{9}.\left( { - 2\frac{1}{2}} \right).\)

Answer 1

[Hà Quang Minh]

a)

\(\left( { - 3,5} \right).\left( {1\frac{3}{5}} \right) = \frac{{ - 7}}{2}.\frac{8}{5} = \frac{{ - 7.8}}{{2.5}} = \frac{{ - 7.4.2}}{{2.5}} = \frac{{ - 28}}{5}\)                  

b) \(\frac{{ - 5}}{9}.\left( { - 2\frac{1}{2}} \right) = \frac{{ - 5}}{9}.\frac{{ - 5}}{2} = \frac{{25}}{{18}}\)