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`Cii `

`[ `Hộ luôn bae=)))`] `
`a)f(x)=x^3-2x+1+x^2+2x^2-x^3+x-5 `

        `=(x-3-x^3)+(x^2+2x^2)+(-2x+x)+(1-5) `

        `=3x^2-x-4 `

`b)f(x)=3x^2-x-4 `

`@ ` Bậc`:2 `

`@ ` Hệ số tự do`:-4 `
`@ ` Hệ số cao nhất`:3 `

`c)f(x)=3x^2-x-4 `

Thay `x=-1 `

`=>f(-1)=3.(-1)^2-(-1)-4 `

            `=3.1-(-1)-4 `

            `=3-(-1)-4 `

            `=4-4 `

            `=0 `