123+123=
456+456=
789+789=
963+963=
852+852=
741+741=
753+753=
159+159=
753-159
159+753
Tìm y: 135 + y - 79 = 753 -31
321 x 321 x 321 x 321 x 0 =
624.....542
398.....399
830.....829
400 + 50 + 7.....457
700 + 35.....753
1000.....999
123 + 321 =
123+321
123 + 321