一个直角三角形,小角是30度,长直角边是1,斜边是1/cos30 = 2/sqrt(3) 而不是根3.
一个直角三角形,小角是30度,长直角边是1,斜边是1/cos30 = 2/sqrt(3) 而不是根3.
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画上你原题的XYZ,看看哪一个扩大后的圆盖住了它们?
-15少-
♂
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03/19/2023 postreply
23:13:47
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