(a-b)/(b-a)
=(a-b)/-(a-b)
=-1
[(a-b)/(b-a)]²=(-1)²=1前面还有个平方(a-b)²／（b-a)=[-（b-a）]²／（b-a）=(b-a)²/(b-a)=b-a∵a≠b（a-b）²=（b-a）²a＞b原式=b-aa＜b原式=b-a
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