亚洲男人天堂av,国产一区二区久久精品,国产精品一区二区久久精品,国产精品久久久久久一区二区三区,五月婷婷在线观看视频,亚洲狠狠色丁香婷婷综合

歡迎您訪問每日一練:一個多邊形有9條對角線,則這個多邊形有多少條邊!

每日一練:一個多邊形有9條對角線,則這個多邊形有多少條邊

更新時間:2024-01-12 12:56:29作者:貝語網(wǎng)校

一個多邊形有9條對角線,則這個多邊形有多少條邊

A.6

B.7

C.8

D.9

試題答案

A

試題解析

可根據(jù)多邊形的對角線與邊的關(guān)系列方程求解.

解答:設(shè)多邊形有n條邊,

則=9,

解得n1=6,n2=-3(舍去),

故多邊形的邊數(shù)為6.

故選A.

點評:這類根據(jù)多邊形的對角線,求邊數(shù)的問題一般都可以化為求一元二次方程的解的問題,求解中舍去不符合條件的解即可.

為您推薦

數(shù)學(xué)考題練習(xí):二元一次方程7x+y=15有幾組正整數(shù)解

二元一次方程7x+y=15有幾組正整數(shù)解A.1組B.2組C.3組D.4組

2024-01-12 12:57

數(shù)學(xué)考題練習(xí):下列具有二次函數(shù)關(guān)系的是

下列具有二次函數(shù)關(guān)系的是A.正方形的周長y與邊長xB.速度一定時,路程s與時間tC.三角形的高一定時,面積y與底邊長xD.正方形的面積y與邊長x

2024-01-12 12:56

數(shù)學(xué)考題練習(xí):將3a(x-y)-b(x-y)用提公因式法分解

將3a(x-y)-b(x-y)用提公因式法分解因式,應(yīng)提出的公因式是A.3a-bB.3(x-y)C.x-yD.3a+b

2024-01-12 12:56

數(shù)學(xué)考題練習(xí):下列關(guān)于總體的說法正確的是

下列關(guān)于總體的說法正確的是A.所要考查的對象稱作總體B.總體是指我們所要研究的對象C.所要考查對象的全體叫做總體D.總體是指所要研究對象的數(shù)量

2024-01-12 12:56

數(shù)學(xué)考題練習(xí):某100元的商品連續(xù)兩次降價,每次降價的百分?jǐn)?shù)

某100元的商品連續(xù)兩次降價,每次降價的百分?jǐn)?shù)相同,降價后的價格為64元,則每次降價的百分?jǐn)?shù)是A.10%B.20%C.30%D.40%

2024-01-12 12:56

數(shù)學(xué)考題練習(xí):機器零件中的六角螺母、足球、書本、煙囪帽、易拉

機器零件中的六角螺母、足球、書本、煙囪帽、易拉罐中,形狀類似于棱柱的物體的個數(shù)有A.0B.1C.2D.3

2024-01-12 12:56

加載中...
主站蜘蛛池模板: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |