Bài 2:<,>,=?
555.......666
453.......435
789.......789
567-45
789-789
123+456+789=
789-123-456=
123+345+567+789+123+345+567+789=? Nhớ kb vs mik nha
522+947
522+741
522+852
963+789
123+456
456+789
123+123=
456+456=
789+789=
963+963=
852+852=
741+741=
753+753=
159+159=
987-789
789:4=
213+789=............