化简求值:(3x+1)(2x-3)-(6x-5)(x-4),其中x=-2

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化简求值:(3x+1)(2x-3)-(6x-5)(x-4),其中x=-2
化简求值:(3x+1)(2x-3)-(6x-5)(x-4),其中x=-2

化简求值:(3x+1)(2x-3)-(6x-5)(x-4),其中x=-2
(3x+1)(2x-3)-(6x-5)(x-4)
=6x^-7x-3-(6x^-29x+20)
=22x-23
ba x=-2代进去得
-67

6x^2-7x-3-(6x^2-29x+20)
=22x-23
带入数值x=-2,那么有,原式=-67