Ответ:
4) 3a^2+7a-5-3a^2-1= 7a-6
x^2-3xy+y^2-x^2+y^2= -3xy+2y^2
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Ответ:
4) 3a^2+7a-5-3a^2-1= 7a-6
x^2-3xy+y^2-x^2+y^2= -3xy+2y^2