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独具慧眼。（对的打“√”，错的打“×”） 1．因为7×10=35×2，所以7：35=10：2。 [ ] 2．若a的2倍等于b的5倍，那么a：b=2：5。 [ ] 3．在比例里，两个外项的积是1，则两个内项互为倒数。 [ ] 4．如果ab=cd，那么a：c=d：b。 [ ] 5．A除B的24，A：B=24：1。 [ ]
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