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I need you help Thank you for helping me!I need you help Thank you for helping me!
I need you help Thank you for helping me!
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I need you help Thank you for helping me!I need you help Thank you for helping me!
12.设AD为X,CD为Y,求ABCD的面积,即求XY的值.
由ABCD周长为16可知,
X+Y=16/2=8
又四个正方形面积为68,其中上下两个相等,左右两个相等,
所以上面正方形面积+右边正方形面积=68/2=34
即X^2+Y^2=34
因为(X+Y)^2=64
(X+Y)^2-(X^2+Y^2)=2XY=64-34=30
所以XY=30/2=15
即ABCD的面积为15
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