Question

如图∠CDA=∠CBA DE平分∠CDA BF平分∠CBA 且∠ADE=∠AED求证DE//FB??拜托各位大神

Answer 1

∠ADE=∠CDE=∠AED，又∠CDE=∠ABF,故∠AED=∠ABF,所以DE//FB