Question

Tính bằng cách thuận tiện nhất a. 1/2 : 1/5 +1/3 : 1/5 + 1/6 : 1/5 b. 1515 x 161616/ 151515 x 1616

Answer 1

a)\(\frac{1}{2}:\frac{1}{5}+\frac{1}{3}:\frac{1}{5}+\frac{1}{6}:\frac{1}{5}\)

=\(\left(\frac{1}{2}+\frac{1}{3}+\frac{1}{6}\right):\frac{1}{5}\)

=\(1:\frac{1}{5}\)

=5

b)\(\frac{1515\text{×}161616}{151515\text{×}1616}\)

=1