(5m立方n平方-6m平方)÷3m

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(5m立方n平方-6m平方)÷3m
(5m立方n平方-6m平方)÷3m

(5m立方n平方-6m平方)÷3m
(5m立方n平方-6m平方)÷3m
=5m立方n平方÷3m-6m平方÷3m
=5/3m²n²-2m