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南一數習六上解答
Sep 8th 2013, 04:31

第三大題：1.：21=（3)X(7)
28=(2)X(2)X(7)
（ 21、28）：7
[21、28]：84
2.：30=（5)X(2)X(3)
48=(2)X(2)X(2)X(2)X(3)
(30、48):6
[30、48]:240
第四大題：1.例：2730=2X3X5X7X13
=13X(2X7)X(3X5)
=13X14X15
2.把2730質因數分解，再看分解完的質數裡面（2〜13少了那一個 質數）
3.算出45、69的最小公倍數

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