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They are: 9+81 = 90
92
2 x 90 = 180
90+8 = 98 is one example
9 and 1
2 square numbers subtracted from each other to make 8 = -6
The numbers are 90 and 180
9 and 36
25 and 81
3 and 5
9+64 = 73
They can be: 16 -4 = 12