2的一倍?
2\u7684\u4e00\u500d\u548c2\u7684\u4e8c\u500d\u662f\u591a\u5c11\uff1f2\u7684\u4e00\u500d\u662f2\u30022\u76842\u500d\u662f4\u3002
\u89e3\u9898\u8fc7\u7a0b\u5982\u4e0b\uff1a
\u6839\u636e\u500d\u6570\u7684\u5b9a\u4e49\uff0c\u4e00\u4e2a\u6570\u9664\u4ee5\u53e6\u4e00\u6570\u6240\u5f97\u7684\u5546\u3002\u5982a\u00f7b=c\uff0c\u5c31\u662f\u8bf4\uff0ca\u662fb\u7684\u500d\u6570\u3002\u4f8b\u5982\uff1aA\u00f7B=C\uff0c\u5c31\u53ef\u4ee5\u8bf4A\u662fB\u7684C\u500d\u3002
\u800c\uff0c2\u00f72=1\uff0c\u4e5f\u5c31\u662f\u8bf42\u662f2\u76841\u500d\u3002
\u800c\uff0c4\u00f72=2\uff0c\u56e0\u6b64\uff0c2\u76842\u500d\u662f4\u3002
\u6269\u5c55\u8d44\u6599\u500d\u6570\u89c4\u5f8b
\u4efb\u610f\u4e24\u4e2a\u5947\u6570\u7684\u5e73\u65b9\u5dee\u662f8\u7684\u500d\u6570
\u8bc1\u660e\uff1a\u8bbe\u4efb\u610f\u5947\u65702n+1,2m+1,(m,n\u2208N)
\uff082m+1)2-(2n+1)2
=(2m+1+2n+1)*(2m-2n)
=4(m+n+1)(m-n)
\u5f53m,n\u90fd\u662f\u5947\u6570\u6216\u90fd\u662f\u5076\u6570\u65f6\uff0cm-n\u662f\u5076\u6570\uff0c\u88ab2\u6574\u9664
\u5f53m,n\u4e00\u5947\u4e00\u5076\u65f6\uff0cm+n+1\u662f\u5076\u6570\uff0c\u88ab2\u6574\u9664
\u6240\u4ee5(m+n+1)(m-n)\u662f2\u7684\u500d\u6570
\u52194(m+n+1)(m-n)\u4e00\u5b9a\u662f8\u7684\u500d\u6570
2\u7684\u4e00\u500d\u662f1\u00d72=2\uff0c\u4e8c\u500d\u5219\u662f2\u00d72=4\u3002=\uffe3\u03c9\uffe3=\u795d\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e0d\u61c2\u53ef\u4ee5\u7ee7\u7eed\u95ee\u6211\u3002
2的一倍是2。是2×1=2,答案是2
4
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