题干

图1是直角梯形,图2是等腰梯形,请你量一量它们的角和边,会发现它们有不同特点,然后根据它们的不同特点,抽象出直角梯形和等腰梯形的定义.

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答案(点此获取答案解析)

一腰垂直于底的梯形叫直角梯形;两腰相等的梯形叫等腰梯形.

同类题5

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    For many people, a special sale is just too attractive to walk away from. ____ But with sales items, how can you be sure you're really getting a good deal? If you understand some sales tricks, you will be able to make smart choices.

    Some tricks have been used by shopkeepers for ages. ____ For example, if an item is US$11.99 instead of US$12.00, you'll feel like you're spending less money.

    Sellers sometimes reduce items by a certain amount. ____ That means that even with the discount, you may still pay more than the original price.

    Shopkeepers clearly understand what makes you want to buy their products. But with a little preparation, you can avoid being cheated.

Tips for shoppers

*Always compare prices before buying anything.

*____ The more focused you are, the easier it is to make wise decisions.

*Don't shop when you are hungry. Studies show that you'll usually buy more than you originally planned.

*____ First ask yourself: Do I have the money to buy it? Will I use it? If not, walk away, but if so, go for it! That way you'll still feel good after you take your item home.

A.Know what you're looking for.

B.Watch for“Buy one, get one free”sales.

C.And that makes shop owners very happy!

D.One of the oldest is to make prices end in 99.

E.Don't buy something just because it's on sale.

F.Check for sales ads in the newspaper or online.

G.But before the sale begins, sellers might mark the prices higher.