(-x^2+5+4x)+(5x-4+2x^2)当x=-2时(-x^2+5+4x)+(5x-4+2x^2)=?

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(-x^2+5+4x)+(5x-4+2x^2)当x=-2时(-x^2+5+4x)+(5x-4+2x^2)=?
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(-x^2+5+4x)+(5x-4+2x^2)当x=-2时(-x^2+5+4x)+(5x-4+2x^2)=?
(-x^2+5+4x)+(5x-4+2x^2)
当x=-2时(-x^2+5+4x)+(5x-4+2x^2)=?

(-x^2+5+4x)+(5x-4+2x^2)当x=-2时(-x^2+5+4x)+(5x-4+2x^2)=?
(-x^2+5+4x)+(5x-4+2x^2)
x^2+1+9x
当x=-2时.
x^2+1+9x=(-2)^2+1+9*(-2)
=4+1-18
=-13

(-x^2+5+4x)+(5x-4+2x^2)
=x^2+9x+1
=4-18+1
=-13

-13

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