Các câu hỏi tương tự
Tính tổng:
A = 1x2+3x4+4x5+...+99x100
B = 1x22+2x32+3x42+4x52+...+99x1002
a=1x1^2+2x2^3+3x4^2+......+98x99^2
2/2x3 + 2/3x4 + 2/4x5 + ... + 2/199x200
2/2x3 + 2/3x4 + 2/4x5 + ... + 2/199x200
2/1x2 + 2/2x3 + 2/3x4 + .............+ 2/18x19 + 2/19x20
2/1x2 + 2/2x3 +2/3x4 +...+2/18x19 + 2/19x20
Rút gọn phân số:
1x2x4+2x3x5+3x4x6+...+100x101x103/1x2^2+2x3^2+3x4^2+...+100x101^2
(1-2/2 x 3)(1-2/3x4)(1-2/4 x 5)......(1-2/12x13)
\(\frac{2}{2x3}+\frac{2}{3x4}+\frac{2}{4x5}+...+\frac{2}{49x50}\)