Ответ:
√2)10
cos(a,b)=ab)/a•b=(n+2m)(3n-m)/(n+2m)
(3n-m)=3n-nm+6mn-2mn
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Ответ:
√2)10
cos(a,b)=ab)/a•b=(n+2m)(3n-m)/(n+2m)
(3n-m)=3n-nm+6mn-2mn