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20 10 a question about the simulation test of the senior high school entrance examination in Pudong New Area
1 . y = 12/(x+4); X>0. Think about it, what is an "extension" line?
2.△APQ =△AEQ+△PEQ = y×4+y×x = y×(x+4)= 12。
3.△APQ=AP×4/2= 12,AP=6。 BP=√27,AE/AP=BC/BP,x/6=4/√27,AE=8/√3,AQ=AE,
⊙A =8/√3-4 radius.
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