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To kallyli mm No50. 一个类似于操场跑道的形状,两个半圆夹一个长方形,告诉直线的距离长,以及长方形面积等于两个半圆型面积和,问长方形另一边的距离 答案:4*L/Pi, 其中L为直线距离长. 我怎么做出来是 pi*(L/2)^2=x*L x=pi*(L/4)-------- I think u make a mistake in assuming the 直线 as the radium. To wenyong GG:46. DF问一个直角三角形的周长,有一个内角是30度,斜边上的高把这个直角三角形分成了两个小直角三角形 1) 其中一个小三角形的周长=XX 2) 另一个直角三角形的周长==DD 答案应为:D. 大中小三角形的任何一边长都可以用原三角形的任一边表示--------I think it is impossible to choose D, if only 1) 其中一个小三角形的周长=XX, we can not decide which one is the 小三角形 that contains the 内角是30度 in the 两个小直角三角形. Although the 两个小直角三角形 both contains the 30 and 60 angel, assume one is bigger and the other is smaller, we can not tell the bigger or the smaller has the 周长=XX , so only 1) can get 2 results for the question. Hope it help....open to discuss...
1) 其中一个小三角形的周长=XX 2) 另一个直角三角形的周长==DD 答案应为:D. 大中小三角形的任何一边长都可以用原三角形的任一边表示--------I think it is impossible to choose D, if only 1) 其中一个小三角形的周长=XX, we can not decide which one is the 小三角形 that contains the 内角是30度 in the 两个小直角三角形. Although the 两个小直角三角形 both contains the 30 and 60 angel, assume one is bigger and the other is smaller, we can not tell the bigger or the smaller has the 周长=XX , so only 1) can get 2 results for the question. Hope it help....open to discuss...
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