Personal number 000 ~ 099100 ~199 ... 899 ~ 999.

( 1)024, 157,290,323,456,589,622,755,888,92 1

(2) k = 0 ~ 9, and x is different when k takes different values.

k=0，x = 87k= 1，x = 87-33 = 54； k=2，x = 87-33 * 2 = 2 1；

K=3, x=87-33*3+ 100=88 (if the subtraction is insufficient, add 100*n, but x is a two-digit number).

K=4, x=87-33*4+ 100=55 (the same below, the process is omitted); k=5，x = 22

k=6，x = 89k=7，x = 56k=8，x = 23k=9，x=90

∴x={2 1,22,23,54,55,56,87,88,89,90}