201010270022JHMC數學題目1題(今天就要) ?國中幾何. 如圖：a + b =20 ,0 <= a <= 20. 設MN = x. MD = a-b , DN = (a+b)/2 =10. x^2 = [√3 / 2 (a-b)]^2 + 10^2.
確定！ 回上一頁
