Tính tổng
1x99+2x98+3x97+........+99x1
A=1x99+3x97+...+49x51
Tính A
giúp mk nha gấp lắm rồi##
Tính
C=1x99 + 2x98 + 3x97 +....+98x2+99x1
Tính nhanh
C=1x99 + 2x98 + 3x97 +....+98x2+99x1
1x99+2x98+3x97+....+97x3+98x2+99x1
tính tổng:a,12x22x33x..........x100100
b,1x99+2x98+3x97+..........+99x1
Simplify:\(A=\frac{1+\frac{1}{3}+\frac{1}{5}+...+\frac{1}{99}}{\frac{1}{1x99}+\frac{1}{3x97}+...+\frac{1}{49x51}}\)
\(SimplifyA=\frac{1+\frac{1}{3+}+\frac{1}{5}...+\frac{1}{99}}{\frac{1}{1x99}+\frac{1}{3x97}+...+\frac{1}{49x51}}\)
