Current location - Training Enrollment Network - Mathematics courses - 20 10 Qianjiang Xiantao Tianmen Jianghan oilfield how to do the eighth question of mathematics in the senior high school entrance examination?
20 10 Qianjiang Xiantao Tianmen Jianghan oilfield how to do the eighth question of mathematics in the senior high school entrance examination?
Yi Zheng △CED∽△BEA
∴DE∶AE=CD∶AB= 1∶2
Even with AD, then ∠ ADB = 90.
∴AD？ +BD？ =AB？
∴AD=2√6
Let de = x and AE = 2x.
De? +AD？ =AE？
x？ +(2√6)? =(2x)？ ∴ x = 2 √ 2 means Germany = 2 √ 2.