Разложите на множители : 

[tex]1) a^{2} + 5a - b^{2} + 5b[/tex] 

[tex]2) p^{2} + 5p - 4q^{2} + 10q[/tex] 

[tex]3) 100m^{2} - 30m - 49n^{2} - 21n[/tex] 

[tex]4) 70m - 49m^{2} - 30n + 9n^{2}[/tex] 

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