1/2x3+1/3x4+1/4x5+....+1/99x100=?
tính:A=1/1x2+1/2x3+1/3x4+1/4x5+...+1/99x100
1/2x3+1/3x4+1/4x5+1/5x6=.......1/99x100
Tính nhanh:. A = 1x2 + 2x3 + 3x4 + 4x5 + ... + 99x100.
Tính nhanh:.
A = 1x2 + 2x3 + 3x4 + 4x5 + ... + 99x100.
tính nhanh
\(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+....+\frac{1}{99x100}\)
Tính:
A=1x2+2x3+3x4+4x5+......+99x100+100x101
tính:2/1x2+2/2x3+2/3x4+2/4x5+...+2/99x100
1x2 + 2x3 + 3x4 + 4x5 + .... +99x100
