39/84*49/81*45/52简算

39/84*49/81*45/52简算
39/84*49/81*45/52简算

39/84*49/81*45/52简算
39/84*49/81*45/52
=39/52x49/84x45/81
=3/4x7/12x5/9
=7/16x5/9
=35/144
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