Помогите !!!!!!!!!!!!!!!!!!!!!!!

Question

Помогите !!!!!!!!!!!!!!!!!!!!!!!

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Answer 1

1) (x-3)²+6x = x²-6x+9+6x = x²+9.
2) 4 см + 5 см = 9 см.
3) луч.
4) y^16 : (y^2)^6 = y^16 : y^12 => y^16-12 = y^4.