Ответ:
10)(2n-9y)(2n+9y)
11)(6a³b⁵-1)(6a³b⁵+1)
12)(a+7)²
13)(5y-1)²
14)(4m-7n)²
15) 7x³(x-y)(x+y)
16)3(x-4y)²
17)-3a³(a²+2)²
18)(a+5b)(1+a-5b)
19)(x-4b+c)(x+4b-c)
20)(x-3-y)(x-3+y)
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Ответ:
10)(2n-9y)(2n+9y)
11)(6a³b⁵-1)(6a³b⁵+1)
12)(a+7)²
13)(5y-1)²
14)(4m-7n)²
15) 7x³(x-y)(x+y)
16)3(x-4y)²
17)-3a³(a²+2)²
18)(a+5b)(1+a-5b)
19)(x-4b+c)(x+4b-c)
20)(x-3-y)(x-3+y)