\(1+\dfrac{1}{2}\left(1+2\right)+\dfrac{1}{3}\left(1+2+3\right)+...+\dfrac{1}{16}\left(1+2+3+...+16\right)\)
\(=\dfrac{2}{2}+\dfrac{1}{2}.\dfrac{2.3}{2}+\dfrac{1}{3}.\dfrac{3.4}{2}+...+\dfrac{1}{16}.\dfrac{16.17}{2}\)
\(=\dfrac{2}{2}+\dfrac{3}{2}+\dfrac{4}{2}+...+\dfrac{17}{2}\)
\(=\dfrac{2+3+4+...+17}{2}\)
\(=\dfrac{\left(17+2\right).16:2}{2}\)
\(=\dfrac{152}{2}=76\)
Tính A = 1 + 1/2 . (1+2) + 1/3 . (1+2+3) + ... + 1/16 . (1+2+3+...+16)
M=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+...+1/16(1+2+3+...+16) = ?
A=1+1/2.(1+2)+1/3.(1+2+3)+...+1/16.(1+2+3+...+16)=?
M=1+1/2(1+2)+1/3(1+2+3)+...+1/16(1+2+3+...+16)
M=1+1/2.(1+2)+1/3.(1+2+3)+......+1/16.(1+2+3+....+16)
Tính P = 1+ 1/2(1+2) + 1/3(1+2+3) + 1/4(1+2+3+4)+...+1/16(1+2+3+...+16)
Tính A=1+1/2.(1+2)+1/3.(1+2+3)+...1/16.(1+2+3+..+16)
Tính: A=1+1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+...+1/16(1+2+3+...+16)
tính p = 1 + 1/2.(1+2)+1/3.(1+2+3)+...+1/16.(1+2+3+4+...+16)
Tính :
P=1 +1/2(1+2)+1/3(1+2+3)+1/4(1+2+3+4)+......+1/16(1+2+3+......+16)
