简答题,请问如何理解会计等式?如同标题,

(1)〔x+a〕〔x+b〕=x2+mx+36
即x^2+(a+b)x+ab=x^2+mx+36
得a+b=m,且ab=36.因为ab为整数,故可以取(1,36),(2,18),(3,12),(4,9),(6,6),所以m可以为37,20,15,13,12.
(2)n(n+5)-(n+2)(n-3)=6(n+1),因为n为正整数,故总能被6整除,且值为n+1,由n确定.
(3)(ax+b)(x+2)=x^2-4
即ax^2+(2a+b)x+2b=x^2-4
得a=1,b=-2.
所以ab=-2

　　芸芸众生,没有谁一生都是一帆风顺的,都会在人生的道路上遇到大大小小的挫折.而正是这些大大小小的挫折才谱就了人生那道平凡而又动听的歌.
　　无数历史的事实和社会的实践证明：挫折几乎伴随着人生命的全部过程,它像埋伏在人生旅途中的顽皮鬼,于不经意间绊你一个或大或小的跟头,使你陷入人生灰色的圈子从而倍感焦虑,甚至失意彷徨,难以自拔.
　　面对挫折,自强者终会知道这是人生路上必须搬开的绊脚石,更能从中体验到战胜困难,超越自我的快乐.奥斯特洛夫斯基说得好：“人的生命似洪水在奔腾,不遇着岛屿和暗焦,难以激起美丽的浪花.”如果我们在挫折面前是勇敢进攻,那么人生就会是一个缤纷多彩的世界.也正如巴尔扎克的比喻：“挫折就像一块石头,对弱者来说是绊脚石,使你停步不前,对强者来说却是垫脚石,它会让你站得更高.”
　　面对挫折,我们不应该有畏惧的心理,而应该心不烦,意不乱地去解开过去,面对现实,创造未来.从挫折中,我们明白了生活来之不易,从而对每一份收获都弥足珍重,拿破仑曾说过这样一句话：最困难之时,就是离成功不远之日.成功是经过多次磨练而成的,所以我们应该好好珍惜.遇到挫折,我们只要相信了自己,才会有勇气去迎接挑战,才不会在困难和挫折面前打退堂鼓.学会面对挫折,也是生命的一种馈赠,因为人们真正的奋起,往往起于挫折之后.

好的：
1. Nestle full cream sweetened condensed milk: convinient to eat
2. Dove chocolate (metal box)：reuse
3. Mengniu Milk: paper is environment friendly material.

差的：
1. Prune: too many small packages inside, a waste of material
2. Coca Cola: half of the metal piece will dip into the liquid when opening.
3. Mooncake: over packaged, cost of package is even more than the products inside.
我想到的就这么多了,希望能帮到你 O(∩_∩)O~

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