(2) Since S=8X- 1/3X*X=45 and X=9, AB=5.

It can form a garden with an area greater than 45 for the following reasons:

s = 8x- 1/3x * x =- 1/3(x2-24x+ 144)+48 =- 1/3(x- 12)2+48。 = 10, using the characteristics of parabola, we can know that when x takes 10, S is the largest, so s= 140/3 is the largest area.

(3) According to the meaning of the question: (77-X)/(N+2)=X/(N+ 1) (that is, according to the equation that a rectangle is a square column):

X=77*(N+ 1)/(2N+3) Let's take n=2, so x=33. This is a process, and the topic only requires results, so you can write one, I just wrote out the steps.

I hope I am the first to answer you. . . .