Разложите на множители: 1) 25x^2 - (x+y)^2 2) 100- (3a+7y)^2 3) 1-(a^2+b^2)^2

1) 25x^2 - (x + y)^2 = (5х)^2 - (x + y)^2 = (5x - (x + y)) * (5x + (x+y)) = (4x - y) (6x + y)2) 100 - (3a + 7y)^2 = 10^2 - (3a + 7y)^2 = (10 - (3a + 7y)) * (10 + (3a + 7y)) = (10 - 3a - 7y) (10 + 3a + 7y)3) 1 - (a^2 + b^2)^2 = 1^2 - (a^2 + b^2)^2 = (1 - (a^2 + b^2)) * (1 + (a^2 + b^2)) = (1 - a^2 - b^2) (1 + a^2 + b^2)