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歡迎您訪問數(shù)學(xué)考題練習(xí):下列各組數(shù)不可能是一個三角形的邊長的是!

數(shù)學(xué)考題練習(xí):下列各組數(shù)不可能是一個三角形的邊長的是

更新時間:2024-01-12 16:28:51作者:貝語網(wǎng)校

下列各組數(shù)不可能是一個三角形的邊長的是

A.1,2,3

B.2,3,4

C.3,4,5

D.4,5,6

試題答案

A

試題解析

看哪個選項(xiàng)中兩條較小的邊的和不大于最大的邊即可.

解答:A、1+2=3,不能構(gòu)成三角形;

B、2+3>4,能構(gòu)成三角形;

C、3+4>5,能構(gòu)成三角形;

D、4+5>6,能構(gòu)成三角形.

故選A.

點(diǎn)評:本題主要考查了三角形的三邊關(guān)系定理:任意兩邊之和大于第三邊,只要滿足兩短邊的和大于最長的邊,就可以構(gòu)成三角形.

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