(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2

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(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2原式=(8x&

(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2
(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2

(4x+1)(2x-3)-(8x-5)(x+3),其中x=-2
原式=(8x²-12x+2x-3)-(8x²+24x-5x-15)
=8x²-10x-3-8x²-19x+15
=9x+12
=-18+12
=-6

70

(-7)*(-7)-(-21)*1=70

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