Ответ:
9(m-2n)-3(n+2m)
9m-18n-3n-6m
3m-21n
9(m-2n)-3(n+2m) = 9m-18n-3n-6m = 3m-21n
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Verified answer
Ответ:
9(m-2n)-3(n+2m)
9m-18n-3n-6m
3m-21n
Ответ:
9(m-2n)-3(n+2m) = 9m-18n-3n-6m = 3m-21n