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(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
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答案和解析
(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
=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
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