更新1:
I am sorry. But what do you mean "combine them 4 smaller x smaller 12"?
ce maths 2002 mc 42
2008-03-27 1:20 am
How many different triangles can be constructed so that the lengths of the three sides are x cm, 2x cm and 12cm, where x is an integer?
回答 (1)
2008-03-27 1:50 am
✔ 最佳答案
first we know that the adding of any two side is greater than the other sideso we get three inequality
x+2x greater 12--------(*)
x+12 greater 2x--------(**)
2x+12 greater x--------(***)
(*) 3x greater 12
x greater 4
(**)12 greater x
x smaller 12
(***)x greater -12
combine them 4 smaller x smaller 12
as x is integer , so there is 7 個 x
so 7 different triangle is form
參考: my math knowledge
收錄日期: 2021-04-29 21:46:56
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