1)5a^2-5-4(a-1)^2 =
2)2(x+y)^2+x^2-y^2 = 
3)a^4+ab^3-a^b-b^4=
4)(x-y+4)^2-x^2+2xy-y^2= 
5)x^3+y^3+2xy(x+y)= 
6)49(y-4)^2-9(y+2)^2=
Решите пожалуйста!!!Очень нужно!!!!!
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