【(a+b)²-(a-b)²】/(-4ab)过程详细点啊!
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【(a+b)²-(a-b)²】/(-4ab)过程详细点啊!
【(a+b)²-(a-b)²】/(-4ab)过程详细点啊!
【(a+b)²-(a-b)²】/(-4ab)过程详细点啊!
【(a+b)²-(a-b)²】/(-4ab)
=【(a+b+a-b)(a+b-a+b)】/(-4ab)
=【2a*2b】/(-4ab)
=4ab/(-4ab)
=-1
展开平方4ab/-4ab=-1