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(1)30=2×3×520=2×2×5所以30和20的最大公因數是2×5=10,最小公倍數是2×5×3×2=60;(2)21=3×77=1×7所以21和7的最大公因數是7,最小公倍數是7×3×1=21;故答案為:10,60;7,21.
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