Question

Tính Nhanh

3/2+3/6+3/12+3/20+3/30

Answer 1

3/2+3/6+3/12+3/20+3/30

=3/2+1/2+1/4+3/20+1/10

=30/20+10/20+5/20+3/20+2/20

=30+10+5+3+2/20

=50/20=5/2

Answer 2

\(\frac{3}{2}\)+\(\frac{3}{6}\)+\(\frac{3}{12}\)+ \(\frac{3}{20}\)+\(\frac{3}{30}\)

= \(\frac{3}{2}\) + \(\frac{1}{2}\)+ \(\frac{1}{4}\)+ \(\frac{3}{20}\)+ \(\frac{1}{10}\)

= \(\frac{30}{20}\)+ \(\frac{10}{20}\)+ \(\frac{5}{20}\)+\(\frac{3}{20}\)+\(\frac{2}{20}\)

= \(\frac{50}{20}\)= \(\frac{5}{2}\)