能用简算就简算 7/9/11/5+2/9*5/11

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能用简算就简算 7/9/11/5+2/9*5/11

7/9/11/5+2/9*5/11
=7/9*5/11+2/9*5/11
=(7/9+2/9)*5/11
=5/11