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2) 36c2 + 6cd + 0,25d2
4) 1/49a² + 2/21ab+1/9b2
6)81d2-27/2cd+9/16c2
2) 36c2 + 6cd + 0,25d2
4) 1/49a² + 2/21ab+1/9b2
6)81d2-27/2cd+9/16c2
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2) 36c² + 6cd + 0,25d²=(6c+0.5d)²
4) (1/49)a² + (2/21)ab+1/9b²=((а/7)+(b/3))²
6)81d²-(27/2)cd+(9/16)c²=(9d-(3/4)c)²