冒泡小白
幼苗
共回答了22个问题采纳率:100% 举报
设菱形长对角线:X
设菱形短对角线:Y
X - Y = 2 (1) Y = X - 2 (1')
(X/2)^2 + (Y/2)^2 = 5^2 (2) “菱形两个对角线相互垂直、互相平分"
由(2)(1') -->
X^2 + Y^2 = 100 --> X^2 + (X - 2)^2 = 100 --> X^2 - 2X - 48 = 0
(X - 8)(X + 6)= 0
X = 8
Y = 6
菱形的面积 S = XY/2 = 48/2 = 24 m^2
1年前
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