1234²-1233×1235 (简便算法
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1234²-1233×1235(简便算法1234²-1233×1235(简便算法1234²-1233×1235(简便算法1234²-1233×1235=1234
1234²-1233×1235 (简便算法
1234²-1233×1235 (简便算法
1234²-1233×1235 (简便算法
1234²-1233×1235
=1234²-(1234-1)(1234+1)
=1234²-(1234²-1)
=1234²-1234²+1
=1
1234²-1233×1235
=1234²-(1234-1)(1234+1)
=1234²-(1234²-1)
=1
1234*1234-(1234+1)*(1234-1)=1234*1234-4*4+1*1=1