若x^2-3x+1=0,则(2x^5-5x^4+2x^3-8x^2)/(x^2+1)的值是多少?
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若x^2-3x+1=0,则(2x^5-5x^4+2x^3-8x^2)/(x^2+1)的值是多少?若x^2-3x+1=0,则(2x^5-5x^4+2x^3-8x^2)/(x^2+1)的值是多少?若x^2
若x^2-3x+1=0,则(2x^5-5x^4+2x^3-8x^2)/(x^2+1)的值是多少?
若x^2-3x+1=0,则(2x^5-5x^4+2x^3-8x^2)/(x^2+1)的值是多少?
若x^2-3x+1=0,则(2x^5-5x^4+2x^3-8x^2)/(x^2+1)的值是多少?
∵x^2-3x+1=0
∴x^2+1=3X
∴(2x^5-5x^4+2x^3-8x^2)/(x^2+1)
=[2X^3(X^2-3x+1)+x^2(x^2-3x+1)+3x(x^2-3x+1)-3x]/3x
=-3x/3x
=-1
x^2-3x+1=0
则x^2=3x-1,1=3x-x^2,x^+1=3x(代入下面的式子)
(2x^5-5x^4+2x^3-8x^2)/(x^2+1)
=[ 2x^3(x^-3x+1)+x^4-8x^2 ]/(x^2+1)
=[2x^2*0+(3x-1)^2-8x^2 ]/(3x-1+1)
=[9x^2-6x+1-8x^ ]/3x
= [ x^2-6x+1]/3x
=[3x-6x] /3x
=-3x/3x=-1
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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