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2011²-2009×2013 =2011²-(2011-2)×(2011+2) =2011²-(2011²-4) =4
2011的平方减2009的平方 =(2011+2009)(2011-2009) =4020x2 =8x1005 如果本題有什麼不明白可以追問, 另外發並點擊我的頭像向我求助,請諒解,
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