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50/17乘9乘51/20 =(50/17×51/20)×9 =15/2×9 =67.5
三十六分之十三加十二分之十一 =三十六分之十三+三十六分之三十三 =三十六分之四十六 =十八分之二十三
8/12+5/12=13/12
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