а) 49p^2-q^2=(7p-q)(7p+q)
б) 1-6a+9a^2=(1-3a)^2=(1-3a)(1+3a)
в) x^2-25y^2=(x-5y)(x+5y)
г) 16+8c+2c=2(8+4c+c)
а) 49p^2-q^2=(7p-q)(7p+q)
б) 1-6a+9a^2=(1-3a)^2=(1-3a)(1+3a)
в) x^2-25y^2=(x-5y)(x+5y)
г) 16+8c+2c=2(8+4c+c)