三角形ABC中,角BAC=45,过C作CD'垂直BA于D',CD'^2=AC^2/2=(AD^2+CD^2)/2
AD垂直BC于D,三角形ADB相似于三角形CD'B
AD/CD'=BA/BC
AD^2/(CD')^2=BA^2/BC^2
AD^2*100=(CD')^2*(BA)^2
100AD^2=[(AD^2+CD^2)/2] * [AD^2+BD^2]
100AD^2=(AD^2+16)(AD^2+36)/2
200AD^2=AD^4+52AD^2+16*36
AD^4-148AD^2=-16*36
(AD^2-72)^2=72^2-16*36=2*64*36
AD^2=72-48√2
AD=2√(18-12√2)
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