Question

Thu gọn đa thức

C= x²-y²+z²-x²+y²-z²+x²+y²+z²

Answer 1

`@` `\text {Ans}`

`\downarrow`

\(C= x^2-y^2+z^2-x^2+y^2-z^2+x^2+y^2+z^2\)

`= (x^2 - x^2 + x^2) + (-y^2 + y^2 + y^2) + (z^2 - z^2 + x^2)`

`= x^2 + y^2 + z^2`

 

 

Answer 2

\(C=x^2-y^2+z^2-x^2+y^2-z^2+x^2+y^2+z^2\)

\(C=\left(x^2-x^2+x^2\right)-\left(y^2-y^2-y^2\right)+\left(z^2-z^2+z^2\right)\)

\(C=x^2-\left(-y^2\right)+z^2\)

\(C=x^2+y^2+z^2\)