1/1x4+1/4x7+...+1/61x64
3/1x4+3/5x9+...+97x101
4/1x3x5+4/3x5x7+...+4/47x49x51
A=1x4+4x7+7x10+.........+94x97
tìm A
Tính tổng : S= 3/1x4 + 3/4x7 + 3/7x10 + ........... + 3/37x40
Tính
3/1x4 + 3/4x7 + 3/7x10 + ... + 3/94x97
Tính
1/1x4+1/4x7+...+1/61x64
3/1x5+3/5x9+...+3/97x101
4/1x3x5+4/3x5x7+...+4/47x49x51
A=3^2/1x4+3^2/4x7+3^2/7x10+...+3^2/97x100
s=1/1x4+1/4x7+1/7x10+...+1/94x97+1/97x100
Tính :
A = 1/1x4+1/4x7+1/7x10+1/10x13+1/13x16
1/1x4 + 1/4x7 + 1/7x10 +............+ 1/16x19 + 1/19x22
ai đúng mình bấm cho
