а) (с+а)^2-9*(c+a)= (c+a)*(c+a-9)
b) (3x-y)^2+4*(3x-y) = (3x-y)*(3x-y+4)
в) (c+5)*(c^2-2c+1) = (c+5)*(c-1)^2
г) (4-a^2)*(1-2a+a^2) = (4-a^2)*(1-a)^2
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Answers & Comments
а) (с+а)^2-9*(c+a)= (c+a)*(c+a-9)
b) (3x-y)^2+4*(3x-y) = (3x-y)*(3x-y+4)
в) (c+5)*(c^2-2c+1) = (c+5)*(c-1)^2
г) (4-a^2)*(1-2a+a^2) = (4-a^2)*(1-a)^2