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单选题
In a triangle in which the lengths of two sides are 5 and 9, the length of the third side is represented by x. Which statement is always true?
A
x > 5
B
x < 9
C
5≤x≤9
D
4 < x < 14
E
5≤ x < 14
参考答案
参考解析
解析：
In a triangle the length of any side is less than the sum of the lengths of the other two sides. If .the lengths of two sides are 5 and 9, and the length of the third side is x, then x<5+9 or x<14, 9<x+5 or 4<x. Since x < 14 and 4 < x, 4<x <14.
In a triangle the length of any side is less than the sum of the lengths of the other two sides. If .the lengths of two sides are 5 and 9, and the length of the third side is x, then x<5+9 or x<14, 9<x+5 or 4<x. Since x < 14 and 4 < x, 4<x <14.
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