x^2+3x-1=0,则x^3+5x^2+5x+18=?
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x^2+3x-1=0,则x^3+5x^2+5x+18=?x^2+3x-1=0,则x^3+5x^2+5x+18=?x^2+3x-1=0,则x^3+5x^2+5x+18=?x^2+3x=1x^3+5x^2
x^2+3x-1=0,则x^3+5x^2+5x+18=?
x^2+3x-1=0,则x^3+5x^2+5x+18=?
x^2+3x-1=0,则x^3+5x^2+5x+18=?
x^2+3x=1
x^3+5x^2+5x+18
=x^3+3x^2+2x^2+5x+18
=x(x^2+3x)+2x^2+5x+18
=x*1+2x^2+5x+18
=2x^2+6x+18
=2(x^2+3x)+18
=2*1+18
=20
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