Предмет: Математика, автор: warshe

(3(2m-5n)-4(-3m+4n))(2(2m-5n)+3*(-3m+4n))

m и n - вектора, их модули равны:
| m | = 2, | n | = 4,
угол между ними равен $2pi /3$

Ответы

Автор ответа: sedinalana

(6m-15n+12m-16n)*(4m-10n-9m+12n)=(18m-31n)*(-5m+2n)=
=-90m²+36mn+155mn-62n²=-90m²+191mn-62n²=
=-90*4+191*2*4*(-1/2)-62*16=-360-764-992=-2116

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(3*(2m-5n)-4*(-3m+4n))*(2*(2m-5n)+3*(-3m+4n)) m и n - вектора, их модули равны: | m | = 2, | n | = 4, угол между ними равен

Ответы

(3(2m-5n)-4(-3m+4n))(2(2m-5n)+3*(-3m+4n))

m и n - вектора, их модули равны:
| m | = 2, | n | = 4,
угол между ними равен $2pi /3$