1. 3)
2. a) (3n+k)²=9n²+6nk+k²
б) (9-1/6y)²=81-3y+1/36y²
в) (7b-2b²)²=49b²-28b²+4b^4
г) (0.3a²b+2a^4)²=0.09a^4b²+1.2a^6b+4a^8
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1. 3)
2. a) (3n+k)²=9n²+6nk+k²
б) (9-1/6y)²=81-3y+1/36y²
в) (7b-2b²)²=49b²-28b²+4b^4
г) (0.3a²b+2a^4)²=0.09a^4b²+1.2a^6b+4a^8