19. Four regular hexagons surround a square with a side length 1, each one sharing an edge with the square, as shown in the figure on the right. The area of the resulting 12-sided outer nonconvex polygon can be written as , where m , n , and p are integers and n is not divisible by the square of any prime. What is m+n+p?Ans: _______。

18. 設f₀(x)=x+| x-100 |-| x+100 |，並對於所有的n≥1，令 。試問有多少個 x 滿足=0?答：_______。

17. 多項式f(x)=，g(x)=x⁴-x³+2x²-x+1求f(x)除以g(x)的餘式為_______