Question

C=x^3+x^2.y-2.x^2-x.y-y^2+3.y+x+2022 với x+y=2.Tính C

 

Answer 1

4364654345343535346545545343434334 đó

Answer 2

Với \(x+y=2=>y=2-x\)
\(C=x^3+x^2y-2x^2-xy-y^2+3y+x+2022\)
\(=x^3+x^2\left(2-x\right)-2x^2-x\left(2-x\right)-\left(2-x\right)^2+3\left(2-x\right)+x+2022\)
\(=x^3+2x^2-x^3-2x^2-2x+x^2-4+4x-x^2+6-3x+x+2022\)
\(=-4+6+2022=2024\)