-1-
-2-
𝒇(x,y)= (10y+1)+y
𝒇(7,3)= 7×31 + 3 = 217 + 3 = 220
Or
𝒇(x,y)= xy 10^⌈log(x+y) + 1⌉ + x+y
𝒇(7,3) = 21 × 10^⌈log(10) + 1⌉ + 10
= 21 × 10² + 10 = 2110
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7-7=0
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