come on看这里,

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come on看这里,

come on看这里,
come on看这里,
 

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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