Question

помогите, пожалуйста:(

Answer 1

1)x^2+2xy+y^2=(x+y)^2
(15(12/13)-9(12/3))=6
2) (5,255)^2-(6,255)^2=(5,255-6,255)(5,255+6,255)=-11,51
3)P=A^3-3A^2B+3AB^2-B^3=(A-B)^3
(3x^2+x+11-3x^2+2x-11)^3=(3x)^3
4)(x^3-y^3)/(x^2+xy+y^2)+(x^3+y^3)/(x^2-xy+y^2)
(x-y)(x^2+xy+y^2)/(x^2+xy+y^2)+(x+y)(x^2-xy+y^2)/(x^2-xy+y^2)
x-y+x+y=2x
2x=2*0,35=0,7

Answer 2

Спааасибоо