1 x 1
= 1
k mik nha
thank you very much
1 x 1
= 1
k mik nha
thank you very much
1/x×{x+1)+1/(x+1)×(x+2)+1/(x+2)×(x+3)-1/x=1/2010
tính: A=1/4+1/12+1/24+....+1/220
B=(1-1/4)x(1-1/9)x(1-1/16)x...x(1-1/100)
C=(1-2/2.3)x(1-2/3.4)x(1-2/4.5)x....x(1-2/99.100)
cả . ,x đều là nhân
TÌm x bt 1/x(x+1) + 1/ (x+1)(x+2)+ 1/ (x+2)(x+3) - 1/x = 1/2010
rút gọn đa thức:
a(x+1)(x-1)
b(x+1)(x-1)(x2+1)
c(x+1)(x-1)(x2+1)(x4+1)-x8
a) (1-1/15) x (1-1/21) x (1-1/28) x ... x (1-1/79800)
b) (1-1/122) x ( 1-1/132) x (1-1/142) x ... x (1-1/802)
Mình đag cần gấp
tìm x, biết :
a) 1/( x+1 ).( x+2 ) + 1/( x+2 ).( x+3 ) + 1/( x+3 ).( x+4 ) + ... + 1/( x+1999).( x+2000) = 1/x+200 = 1/5
b) 2/( x+1 ).( x+3 ) + 3/( x+3 ) .( x+6 ) + 4/( x+6 ).( x+10 ) + ... + 10/( x+45 ).( x+55 ) + 1/ x+55 = 1/6
bai 11;tim x
1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)-1/x=1/2010
a, |x-1/2|=|3|
b, 2|x-1|+3|x-1|=5
c, |-2/3|.|2x-1|=4/3.|x-1|+1
d, |x-1|-x=-1
e, |3x-2|=|x-1|
f,|2x-1|+2x=1
g, 2|x-1/2|=|x+1|
h, 3|x-1/3|+5|3/x-1/5|=2
Bài tập :Tính :
A =(1/10-1) x (1/11-1) x (1/12-1) X .... X (1/99-1) x (1/100-1)