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Tính :
a) 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.....+1
b)1/1x2x3+1/2x3x4+1/3x4x5+.....+1/98x99x100
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
\(\frac{ }{ }\)
tính : 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6
Tính
A = 3x4+4x5+5x6+6x7+.....+79x80
B = 1x2x3+3x4x5+5x6x7+.....+98x99x100
C = 1x4+2x5+3x6+4x7+.....+97x100
Tính nhanh:
1/1x2x3 + 1/2x3x4 + 1/3x4x5 + ... + 1/98x99x100
Giải dùm mình với!!!!
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6
Tính H=\(\frac{1}{1x2}\) -\(\frac{1}{1x2x3}\) +\(\frac{1}{2x3}\) -\(\frac{1}{2x3x4}\) +\(\frac{1}{3x4}\) -\(\frac{1}{3x4x5}\) +...+\(\frac{1}{99x100}\) -\(\frac{1}{99x100x101}\)
tinh
a)A=1x2+2x3+3x4+............+99x100
b)B=1x3+3x5+5x7+............97x99
c)C=1x2x3+2x3x4+..............98x99x100
a. 1/1x2 + 1/2x3 +...+ 1/2006x2007b. 2006/1x2 + 2006/2x3 +...+ 2006/2006x2007c. 1/1x2x3 + 1/2x3x4 +...+ 1/2004x2005x2006
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