Татьяна Шипунова
Алексей
[m,n] = [3a+b, a-4b] = 3[a,a]-12[a,b] +[b,a] -4[b,b] = 13[b,a]
|[m,n]| = 13*|b|*|a|* sin(150) = 13*5*2*1/2 = 65
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[m,n] = [3a+b, a-4b] = 3[a,a]-12[a,b] +[b,a] -4[b,b] = 13[b,a]
|[m,n]| = 13*|b|*|a|* sin(150) = 13*5*2*1/2 = 65