Question

[edogawa conan]

tinh thuan tien 

a 15/50 +20%+5/100+0,45

b 3/6x8/12x15/20x24/30x35/42x48/56x65/72x80/90

Answer 1

[I don't need you]

a) \(\frac{15}{50}+20\%+\frac{5}{100}+0,45\)

\(=\frac{3}{10}+\frac{1}{5}+\frac{1}{50}+\frac{9}{20}\)

\(=\frac{97}{100}\)

b) \(\frac{3}{6}\times\frac{8}{12}\times\frac{15}{20}\times\frac{24}{30}\times\frac{35}{42}\times\frac{48}{56}\times\frac{65}{72}\times\frac{80}{90}\)

\(=(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{6}\times\frac{6}{7})\times\frac{65}{72}\times\frac{8}{9}\)

\(=\frac{1}{7}\times\frac{65}{72}\times\frac{8}{9}\)

\(=\frac{65}{567}\)