Question

tính giá trị biểu thức sau:

\(B=\left(1-\dfrac{1}{7}\right).\left(1-\dfrac{2}{7}\right).\left(1-\dfrac{3}{7}\right)...\left(1-\dfrac{2011}{7}\right)\)

Answer 1

\(B=\left(1-\dfrac{1}{7}\right).\left(1-\dfrac{2}{7}\right).\left(1-\dfrac{3}{7}\right)...\left(1-\dfrac{2011}{7}\right)\)

\(B=1-\left(\dfrac{1}{7}.\dfrac{2}{7}.\dfrac{3}{7}...\dfrac{2011}{7}\right)\)

Tự tính nốt

Answer 2

B=\(\left(1-\dfrac{1}{7}\right)\left(1-\dfrac{2}{7}\right)....\left(1-\dfrac{7}{7}\right)...\left(1-\dfrac{2011}{7}\right)\)

B=\(\left(1-\dfrac{1}{7}\right)\left(1-\dfrac{2}{7}\right)...0...\left(1-\dfrac{2011}{7}\right)=0\)