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
2) 100- (3a+7y)^2
3) 1-(a^2+b^2)^2
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2) (10-3a-7y)(10+3a+7y)
3) (1-a^2-b^2)(1+a^2+b^2)