12-9=11. 18-6=39. 21-7=139. 16-5=?
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2=5,4=18,6=39,8=68,10=105
AS
2=2×2+1=5
4=4×4+2=18
6=6×6+3=39
8=8×8+4=68
10=10×10+5=105
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