5.5×6.6+6.6×7.7+7.7×8.8+8.8×9.-查字典问答网
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来自李宝泽的问题

  5.5×6.6+6.6×7.7+7.7×8.8+8.8×9.9.

  5.5×6.6+6.6×7.7+7.7×8.8+8.8×9.9.

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2020-04-2220:15
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金立刚

  5.5×6.6+6.6×7.7+7.7×8.8+8.8×9.9

  =1.1×5×1.1×6+1.1×6×1.1×7+1.1×7×1.1×8+1.1×8×1.1×9

  =1.1×1.1×5×6+1.1×1.1×6×7+1.1×1.1×7×8+1.1×1.1×8×9

  =1.21×30+1.21×42+1.21×56+1.21×72

  =1.21×(30+42+56+72)

  =1.21×200

  =242.

2020-04-22 20:18:05
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