Упростите выражение : 1) (а-3)^2 + а(а+9) ; 2) 9b(b-1)-(3b+2)^2 ; 3) (a+3)(5-a)-(a-1)^2 ; 4)b^2 +49-(b-7)^2 ; 5)a^2b^2-(ab-y)^2
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