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105的約數有:1,3,5,7,15,21,35105;105=1×105;105=3×35;105=5×21;105=7×15;所以能拼成的長方形的長與寬分別是105和1,35和3,21與5,15與7;答:能拼成4種不同的長方形.故答案為:4.
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