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歡迎您訪問數學考題練習:由下列長度的三條線段能組成三角形的是!

數學考題練習:由下列長度的三條線段能組成三角形的是

更新時間:2024-01-12 16:30:49作者:貝語網校

由下列長度的三條線段能組成三角形的是

A.1cm,2cm,3cm

B.3cm,4cm,5cm

C.5cm,15cm,8cm

D.6cm,8cm,1cm

試題答案

B

試題解析

根據三角形的三邊關系“任意兩邊之和大于第三邊,任意兩邊之差小于第三邊”,進行分析.

解答:根據三角形的三邊關系,知

A、1+2=3,不能組成三角形;

B、3+4>5,能夠組成三角形;

C、5+8<15,不能組成三角形;

D、1+6<8,不能組成三角形.

故選B.

點評:此題考查了三角形的三邊關系.判斷能否組成三角形的簡便方法是看較小的兩個數的和是否大于第三個數.

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