( 2 ﹣1)2=( 2 )2﹣2×1× 2 +12=2﹣2 2 +1=3﹣2 2
反之3﹣2 2 =2﹣2 2 +1=( 2 ﹣1)2
∴3﹣2 2 =( 2 ﹣1)2
∴ 3−22 = 2 ﹣1
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