Question

Ai làm được bài này mình cho 3 tích

Chứng minh rằng :\(E=\left(1-\frac{1}{7}\right).\left(1-\frac{2}{7}\right).\left(1-\frac{3}{7}\right)...\left(1-1\frac{2}{7}\right)\)

\(.\left(1-1\frac{3}{7}\right)\)

Answer 1

\(E=\left(1-\frac{1}{7}\right).\left(1-\frac{2}{7}\right)...\left(1-1\frac{2}{7}\right).\left(1-\frac{3}{7}\right)\)

\(E=\left(1-\frac{1}{7}\right).\left(1-\frac{2}{7}\right)...\left(1-\frac{7}{7}\right)...\left(1-1\frac{2}{7}\right).\left(1-\frac{3}{7}\right)\)

\(E=\left(1-\frac{1}{7}\right).\left(1-\frac{2}{7}\right)...0...\left(1-1\frac{2}{7}\right).\left(1-\frac{3}{7}\right)\)

\(E=0\)