Các câu hỏi tương tự
\(\frac{x-10}{1994}+\frac{x-8}{1996}+\frac{x-6}{1998}+\frac{x-4}{2000}+\frac{x-2}{2002}=\frac{x-2002}{2}+\frac{x-2000}{4}+\frac{x-1998}{6}+\frac{x-1996}{8}+\frac{x-1994}{10}\)
A=-1-2+3+4-5-6+7+8-....-1997-1998+1999+2000
B=1+(-2)+(-3)+4+5+-6+-7+8+...+1997+(1998)+(-1999)+2000
A =-1 -2 +3+4 -5 -6+7+8- 9- 10+11 +12-...- 1997- 1998 +1999+ 2000
Tính nhanh
S = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - ...... + 1998 - 1999 - 2000 + 2001 + 2002
x-6/1998+x-4/2000=x-2000/4+x-1998/6
Tìm x :
a) \(\frac{x+1}{2000}+\frac{x+2}{1999}+\frac{x+ 3}{1998}+\frac{x+4}{1997}=-4\)
\(b.\frac{x+1}{1999}+\frac{x+2}{2000}+\frac{x+3}{2001}=\frac{x+4}{2002}+\frac{x+5}{2003}+\frac{x+6}{2004}\)
cho a va b biet a^2000+b^2000= a^1998+ b^1998 . CMR a^2+b^2< 2
Cho x , y , z thỏa mãn : x / 1998 = y / 1999 = z / 2000. CMR ( x - z ) ^ 2 = 8 ( x-y ) ^ 2 (y - z)