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歡迎您訪問數學考題練習:已知等腰三角形ABC的底邊BC=5,且|AC-!

數學考題練習:已知等腰三角形ABC的底邊BC=5,且|AC-

更新時間:2024-01-12 16:26:21作者:貝語網校

已知等腰三角形ABC的底邊BC=5,且|AC-BC|=2,那么腰AC的長為

A.3

B.3或7

C.7

D.4或7

試題答案

B

試題解析

根據絕對值的意義,得腰比底邊大2或腰比底邊小2.兩種情況都符合三角形的三邊關系.

解答:∵BC=5,且|AC-BC|=2,

∴AC=3或AC=7.

3,3,5和7,7,5都符合三角形的三邊關系.

故選B.

點評:本題考查了等腰三角形的性質和三角形的三邊關系;注意最后不要忘記看是否符合三角形的三邊關系.

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