Question

4/3×7 + 5/7×12 + 1/12×13 + 7/13×20 + 3/20×23

Nhờ trình bày giúp + giải thích nha

 

Answer 1

=\(\frac{4}{3}\times\left[7+\frac{5}{7}\right]\times\left[12+\frac{1}{12}\right]\times\left[13+\frac{7}{13}\right]\times\left[20+\frac{3}{20}\right]\times23\)

\(=\frac{4}{3}\times\frac{12}{7}\times\frac{13}{12}\times\frac{20}{13}\times\frac{23}{20}\times23\)

\(\frac{4}{3}\times\left[\frac{12}{7}\times\frac{13}{12}\right]\times\left[\frac{20}{13}\times\frac{23}{20}\right]\times23\)

\(=\frac{4}{3}\times\frac{13}{7}\times\frac{23}{13}\times23\)

\(\frac{4}{3}\times\left[\frac{13}{7}\times\frac{23}{13}\right]\times23\)

\(\frac{4}{3}\times\frac{23}{7}\times23\)

con lai ban tu tinh nhe