Ответ:
(а+2b) * b = ab+2b²
ab= 3*√2 * cos 135° = 3*√2 * ( -√2/2) = -3
b² = |b|² = (√2) ²= 2
2b²= 4
ab+2b² = -3*4=-12
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Ответ:
(а+2b) * b = ab+2b²
ab= 3*√2 * cos 135° = 3*√2 * ( -√2/2) = -3
b² = |b|² = (√2) ²= 2
2b²= 4
ab+2b² = -3*4=-12