come on看这里,

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/15 16:57:08

come on看这里,
 

∵BE=DF
∴BF=DE①
∵ABCD为平行四边形
∴BC∥=DA②
∴∠CBD=∠ABD③
∵①②③
∴△CBF≌△ADE
∴AE=CF

AE和CF中间可以看成是一个平行四边形，而AE和CF就是它的两条对角边。

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