Tính : A = ( 1 - 1/2 ) *( 1 - 1/3 ) *( 1 - 1/4 ) *( 1 - 1/5 ) ..... ( 1 - 1/2016 ) *( 1 - 1/2017 )
A = (1 - 1/2) x (1 - 1/3) x (1 - 1/4) x (1 - 1/5) x ... (1 - 1/2016) x (1 - 1/2017)
tính giá trị biểu thứ
A = (6:3/5 -1/1/6 x 6/7 ) : (4/1/5 x10/11+5/2/11)
B = (1-1/2)(1-1/3)(1-1/4)...(1-1/2016)(1-1/2017)
So sánh 1/2*3+1/3*4+1/4*5+........+1/2016*2017 với 1/2
A=(1-1/2)x(1-1/3)x(1-1/4)...(1-1/2016)x(1-1/2017)
A= 1+2+3+...+2016
B=1+3+5+...+2017
C=1*2+2*3+3*4+...+10*11
D=1*1+2*2+3*3+...+10*10
câu a) ( 1/2018 - 1/2017 + 1/2016 ) * ( 5/6-1/2 -1/3)
\(\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{2015}-\frac{1}{2016}+\frac{1}{2017}\)
tính tổng sau 1/1*2 + 1/2*3 + 1/3*4 + ... + 1/2016*2017 +1
