|x1-1|+(x2-2)²+|x3-3|³+(x4-4)^4+…+|x1999-1999|^199
1个回答

∵|x1-1|+|x2-2|^2+|x3-3|^3+······+|x2000-2000|^2000=0,

∴x1=1、x2=2、x3=3、x4=4、x5=5、······、x2000=2000,

∴1/(x1x2)+1/(x2x3)+1/(x3x4)+1/(x4x5)+······+1/(x1999x2000)

=1/(1×2)+1/(2×3)+1/(3×4)+1/(4×5)+······+1/(1999×2000)

=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+······+(1/1999-1/2000)

=1-1/2000

=1999/2000.