A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2选B.怎么做?谢谢!

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A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2选B.怎么做?谢谢!
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A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2选B.怎么做?谢谢!
A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?
(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2
选B.怎么做?谢谢!

A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2选B.怎么做?谢谢!
设中间那个边为a,两边为b
有a+2b=x,x是常数,a=x-2b
有S=ab,即S=（x-2b）b=-2(b^2-0.5xb+(0.25x)^2)+(0.25x)^2既化为那种一个二次项的形式
所以S的最大值选B

有a total of 和 the total of a total of和the total of的区别 A total of x feet of fencing is to form three sides of a level rectangular yard. What is the (继续) maximum possible area of the yard, in terms of x?(A)x^2/9(B)x^2/8(C)x^2/4(D)x^2(E)2x^2选B.怎么做?谢谢! in total 与 a total of 的区别 SAT数学题求翻译及完整解题步骤A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the tabletop is x square feet, and the total length of the strip before it 用a total of 造个句子 we need a total of 140 a total of什么意思及同义词 a company produces x items of a product at a total cost of (50+2X) dollars. Total value of total number of pallet 50 feet of nylon Feet of Clay 歌词 a total we spent a total of ten years in korea,germany and japan. 英语翻译A developer has land that has x feet of lake frontage.The land is to be subdivided into lots,each of which is to have either 80 feet or 100 feet of lake frontage.If 1/9 of the lots are to have 80 feet of frontage each and the remain 40 lo English Math~A cage at the Woodland Park Zoo in Seattle contains both wild turkeys and white tailed deer.If there are a total of 108 eyes and 168 feet in the cage,how many deer are in the cage? collect a total of 50 diamonds什么意思 My house a total of three people的翻译