lớn bé bằng

5 + 1 + 2 < 8 – 2 + 3                                   9 – 5 + 3 = 8 + 2 – 3

6 – 5 + 9 > 3 + 4 – 7                                     5 – 1 – 2 < 9 – 4 + 4