试题与答案

根据下列各式,回答问题: ①11×29=202-92 ②12×28=202-82

题型:解答题

题目:

根据下列各式,回答问题:

①11×29=202-92

②12×28=202-82

③13×27=______

④14×26=202-62

⑤15×25=202-52

⑥16×24=202-42

⑦17×23=______

⑧18×22=202-22

⑨19×21=202-12

⑩20×20=202-02

(1)请把③⑦分别写成一个“□2-○2”(两数平方差)的形式,并将以上10个乘积按照从小到大的顺序排列起来;(直接用序号表示)

(2)若乘积的两个因数分别用字母a,b表示(a,b为正数),请观察直接写出ab与a+b的关系式;(不需要说明理由)

(3)若用a1b1,a2b2,…,anbn表示n个乘积,其中a1,a2,a3,…,an,b1,b2,b3,…,bn为正数.请根据(1)中乘积的大小顺序猜测出一个一般结论.(不需要说明理由)

答案:

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参考答案:水龙头

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Some consumer researchers distinguish (1) "rational" motives and "emotional" (or "non-rational") motives. They use the term "rationality" (2) the traditional economic sense that assumes (3) consumers behave rationally when they carefully consider all alternatives (4) choose those that give them the greatest utility (i.e., satisfaction). (5) a marketing context, the term "rationality" implies that the consumer selects goods based (6) totally objective criteria, such (7) size, weight, price, and so on. "Emotional" motives imply the selection of goods (8) to personal or subjective criteria—the desire (9) individuality, pride, fear, affection or status.
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