一個直角三角形,小角是30度,長直角邊是1,斜邊是1/cos30 = 2/sqrt(3) 而不是根3.
一個直角三角形,小角是30度,長直角邊是1,斜邊是1/cos30 = 2/sqrt(3) 而不是根3.
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畫上你原題的XYZ,看看哪一個擴大後的圓蓋住了它們?
-15少-
♂
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03/19/2023 postreply
23:13:47
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