(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2

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(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2(x+2)(x-3)+3(x-1

(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2
(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2

(x+2)(x-3)+3(x-1)(x+1)-(2x-1)(2x+3),其中x=-2
原式=(x²-x-6)+3(x²-1)-(4x²+4x-3)
=x²-x-6+3x²-3-4x²-4x+3
=-5x-6
=-5*(-2)-6
=4

原式=(x²-x-6)+3(x²-1)-(4x²+4x-3)
=x²-x-6+3x²-3-4x²-4x+3
=-5x-6
=-5×(-1/5)-6
=-5

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