If you have a computer/calculator

来源: 于 2010-07-29 12:27:44 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Then you may compute three sums:
S_1=x_1+...+x_997
S_2=x_1*x_1+...+x_997*x_997
S_3=x_1*x_1*x_1+...+x_997*x_997*x_997

to find out three sums for the missing three numbers. Then solve the equations to find them.