Các câu hỏi tương tự
A = 1/1x2x3 + 1/2x3x4 + 1/3x4x5 +...+ 1/18x19x20 < 1/4B = 36/1x3x5 + 36/3x5x7 + 36/5x7x9 +...+ 36/25x27x29 < 3C = 1/2^2 + 1/3^2 + 1/4^2 +...+ 1/100^2 < 1D = 1/101 + 1/102 + 1/103 +...+ 1/999 + 1/200 > 7/12
Xem chi tiết
Tính nhanh:4/1x3x5+4/3x5x7+4/5x7x9+4/7x9x11+4/9x11x13+4/11x13x15
C1x2+2x3+3x4+........+99x100D1x2x3+2x3x4+3x4x5+.......+98x99x100E12+22+52+.......+992F1/1x2+1/2x3+..........+1/99x100G1/1x2x3+1/2x3x4+........+1/99x98x100H 1/1x2x3x4+1/3x4x5x6+............+1/97x98x99x100K 1+1/2(1+2)+1/3(1+2+3)+........+1/30(1+2+30)L1/21+1/22+1/23+1/24+..............+1/210M2015/2015x2017-20162frac{ }{ }
Đọc tiếp
C=1x2+2x3+3x4+........+99x100
D=1x2x3+2x3x4+3x4x5+.......+98x99x100
E=12+22+52+.......+992
F=1/1x2+1/2x3+..........+1/99x100
G=1/1x2x3+1/2x3x4+........+1/99x98x100
H= 1/1x2x3x4+1/3x4x5x6+............+1/97x98x99x100
K= 1+1/2(1+2)+1/3(1+2+3)+........+1/30(1+2+30)
L=1/21+1/22+1/23+1/24+..............+1/210
M=2015/2015x2017-20162
\(\frac{ }{ }\)
A=1+2+3+4+...+2016+2017
B=1x2+2x3+3x4+...+2017x2018
C=1x2x3+2x3x4+3x4x5+...+n x (n+1)x(n+2)
D=3333...3 x 6666...6 ( Chú thích: 3333...3 có 100 chữ số 3 ; 6666...6 có 100 chữ số 6)
Bạn nào làm đúng và có lời giải thì mình tk cho nhé!
A=1x2+2x3+3x4+...+49x50
B=1x3+3x5+5x7+...+99x101
C=1x2x3+2x3x4+3x4x5+...+50x51x52
D=1x4+2x5+3x6+...+60x63
E=1x1+2x2+3x3+...+50x50
F=1x1+3x3+5x5+...+71x71
G=1x1+4x4+7x7+...+100x100
I=1x2x3+3x4x5+5x6x7+...+69x70x71
Tính :
a) 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.....+1
b)1/1x2x3+1/2x3x4+1/3x4x5+.....+1/98x99x100
Tính :
a) 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.....+1
b)1/1x2x3+1/2x3x4+1/3x4x5+.....+1/98x99x100
1/1x4+1/4x7+...+1/61x64
3/1x4+3/5x9+...+97x101
4/1x3x5+4/3x5x7+...+4/47x49x51
Tính
1/1x4+1/4x7+...+1/61x64
3/1x5+3/5x9+...+3/97x101
4/1x3x5+4/3x5x7+...+4/47x49x51