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数学
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计算:
1×2×3+3×6×9+5×10×15+7×14×21
1×3×5+3×9×15+5×15×25+7×21×35
=______.
人气:183 ℃ 时间:2019-10-23 07:52:43
解答
1×2×3+3×6×9+5×10×15+7×14×211×3×5+3×9×15+5×15×25+7×21×35,=1×2×3+33×1×2×3+53×1×2×3+73×1×2×31×3×5+33×1×3×5+53×1×3×5+73×1×3×5,=1×2×3×(13+33+53+73)1×3×5×(13+33...
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