a2-b2=x-1, a-b=(x-1)/ x
可以分别写成
a2-b2=a+b-1,a-b=b2
求得a=1
a2-b2=x-1, a-b=(x-1)/ x
可以分别写成
a2-b2=a+b-1,a-b=b2
求得a=1
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