已知a+x2=2000,b+x2=2001,c+x2=2002,且abc=24,求a/bc+c/ab+b/ac−1/a−1/b−1/c的值.

问题描述:

已知a+x2=2000,b+x2=2001,c+x2=2002,且abc=24,求

a
bc
+
c
ab
+
b
ac
1
a
1
b
1
c
的值.

∵a+x2=2000,b+x2=2001,c+x2=2002,
∴b-a=1,c-b=1,c-a=2,
∵abc=24,

a
bc
+
c
ab
+
b
ac
1
a
1
b
1
c

=
a2b2+c2−bc−ac−ab 
abc

=
2a2+2b2+2c2−2bc−2ac−2ab
2abc

=
(a−b)2+(a−c)2+(b−c)2
2abc

=
1+4+1
2×24

=
1
8