设直角边为a,b
那么 a + b = 2+根号6 - (1 * 2) = 根号6
a^2 + b^ 2 = 4
(a + b) ^2 - 2ab = 4
2ab = 2
ab = 1
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当然是1/2阿,直角三角形面积是 ab/2 阿,我只不过少写一步而已~