(3x+2)(3x-2)-5x(x-1)-(2x-1)² 其中x=负三分之一

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(3x+2)(3x-2)-5x(x-1)-(2x-1)² 其中x=负三分之一
(3x+2)(3x-2)-5x(x-1)-(2x-1)² 其中x=负三分之一

(3x+2)(3x-2)-5x(x-1)-(2x-1)² 其中x=负三分之一
(3x+2)(3x-2)-5x(x-1)-(2x-1)²
=9x^2-4-5x^2+5x-4x^2+4x-1 ·······················因式分解
=9x-4-1 ······················合并同类项
=-3-4-1 ························将“x=负三分之一”代入得
=-8

(3x+2)(3x-2)-5x(x-1)-(2x-1)²
=9x²-4-5x²+5x-4x²+4x-1
=-5+9x
=-5-3
=-8

(3x+2)(3x-2)-5x(x-1)-(2x-1)²
=9x²-4-(5x²-5x)-(4x²-4x+1)
=9x²-4-5x²+5x-4x²+4x-1
=-x-5
=1/3-5
=-14/3

--8

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