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Mathematics of Grade Two, Book Two, Chapter Two
Solution: ∫A = A-2 b+3√a+3b is the arithmetic square root of A+3b.

∴a-2b+3=2,

∫B = 2a-B- 1√ 1- A cube root whose square is1-a.

∴2a-b- 1=3,

The simultaneous solution of the two formulas is: a=3, b=2,

∴A= radical number 3+3×2=3,

B= the square of the number of cubic roots 1-3 =-2,

∴A+B=3+(-2)= 1,

The square root of a+b is 1.