\(A=\left(\dfrac{1}{2}+1\right)\left(\dfrac{1}{3}+1\right)...\left(\dfrac{1}{99}+1\right)\)
\(=\dfrac{3}{2}.\dfrac{4}{3}...\dfrac{100}{99}\)
\(=\dfrac{100}{2}=50\)
\(A=\dfrac{3}{2}.\dfrac{4}{3}.\dfrac{5}{4}....\dfrac{100}{99}=\dfrac{100}{2}=50\)
Tính nhanh :
A = (1/2 + 1 ) . ( 1/3 + 1 ) . ( 1/4 +1 ) . ( 1/5 + 1 ) .... ( 1/99 + 1 )
A = 3/2 . 4/3 . ... . 100/99
A = 100/2 = 50
\(A=\left(\dfrac{1}{2}+1\right)\left(\dfrac{1}{3}+1\right)\left(\dfrac{1}{4}+1\right)\left(\dfrac{1}{5}+1\right)...\left(\dfrac{1}{99}+1\right)\)
\(=\dfrac{3}{2}\cdot\dfrac{4}{3}\cdot\dfrac{5}{4}\cdot\dfrac{6}{5}...\dfrac{100}{99}\)
\(=\dfrac{3\cdot4\cdot5\cdot6...100}{2\cdot3\cdot4\cdot5...99}\)
\(=\dfrac{100}{2}=50\)
\(A=\left(\dfrac{1}{2}+1\right)\left(\dfrac{1}{3}+1\right)\left(\dfrac{1}{4}+1\right)\left(\dfrac{1}{5}+1\right).....\left(\dfrac{1}{99}+1\right)\)\(A=\dfrac{3}{2}.\dfrac{4}{3}.\dfrac{5}{4}.\dfrac{6}{5}...............\dfrac{100}{99}\)
\(A=\dfrac{3.4.5.6.....100}{2.3.4.5.....99}\)
\(A=\dfrac{100}{2}=50\)
A= (\(\dfrac{1}{2}+1\)) (\(\dfrac{1}{3}+1\)) (\(\dfrac{1}{4}+1\)) (\(\dfrac{1}{5}+1\)) ...... (\(\dfrac{1}{99}+1\))
A= \(\dfrac{3}{2.}\dfrac{4}{3.}\dfrac{5}{4.}\dfrac{6}{5.}......................\dfrac{100}{99}\)
A= \(\dfrac{3.4.5.6........100}{2.3.4.5...........99}\)
A= \(\dfrac{100}{2}=50\)
