咸津话梅
幼苗
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AC^2=AD^2 + DC^2=3^2 + 4^2=25 ==> AC=5AD^2 + DE^2=CE^2, CE+DE=4 ==> 3^2 + DE^2=(4-DE)^2 ==> 9+DE^2=14-8DE+DE^2 ==> DE=5/8CE=4-(5/8)=3 3/8(EF/2)^2= CE^2-(AC/2)^2=(27/8)^2-(5/2)^2=(329/64)^2 ==> EF/2=329/64 ==> EF=329/32=10(9/32)
1年前
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