Đặt A=1/3x1 + 1/3x5 + ......+ 1/95x97 + 1/97x99
\(2A=1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+...+\frac{1}{97}-\frac{1}{99}\)
\(2A=1-\frac{1}{99}\)
\(A=\frac{98}{99}:2\)
\(A=\frac{49}{99}\)
1/3x1 + 1/3x5 + ......+ 1/95x97 + 1/97x99
tính tổng: 2/11x13 + 2/13x15 + 2/15x17 +...+ 2/95x97 + 2/97x99
Tính nhanh giá trị biểu thức sau:
\(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+.....+\frac{2}{95x97}+\frac{2}{97x99}\)
1/5x7 + 1/7x9 + 1/9x11 +………1/97x99
1/1x3+1/3x5+......+1/97x99 = ?
1/1x3 + 1/3x5 + 1/5x7 + .... + 1/97x99
1/3x5+1/5x7+1/7x9+...+1/97x99
1/3x1/6x1/9 1/3x1/6:1/9 1/3:1/6x1/9
Giúp mk giả bài toán này nha!!!!!!!!
tính 1 1/3x1 1/8x1 1/5x1 1/24x......x1 1/99
mik cần gấp