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歡迎您訪問數(shù)學考題練習:一個直角三角形的兩條直角邊都擴大2倍,則它的斜!

數(shù)學考題練習:一個直角三角形的兩條直角邊都擴大2倍,則它的斜

更新時間:2024-01-12 16:24:36作者:貝語網校

一個直角三角形的兩條直角邊都擴大2倍,則它的斜邊擴大_______倍.

A.1

B.2

C.3

D.4

試題答案

B

試題解析

設直角三角形的兩直角邊分別是x,y,求出原來的斜邊和擴大后的斜邊,然后可求出結果.

解答:設直角三角形的兩直角邊分別是x,y,

原來直角三角形的斜邊:.

兩條直角邊都擴大2倍后兩直角邊為2x,2y,

則斜邊:=2.

所以斜邊也擴大2倍.

故選B.

點評:本題考查理解題意的能力,本題可設出直角邊,求出變化前和變化后的斜邊做比較就可求得結果.

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