Question

Помогите решить примеры)

Answer 1

$3(2-x)^2-(2x^2+x-5)(x^2-2)+(x^2+4)(4-x^2)= \ =3(4-4x+x^2)-(2x^4+x^3-5x^2-4x^2-2x+10)+16-x^4= \ =12-12x+3x^2-2x^4-x^3+9x^2+2x-10+16-x^4= \ =-3x^4-x^3+12x^2-10x+18$