(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2
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(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2(-6+1)(-4-
(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2
(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2
(3x+1)(2x-3)-(6x-5)(x-4)其中x=-2
(-6+1)(-4-3)-(-12-5)(-2-4)=35-102=-67
x=-2
(3x+1)(2x-3)-(6x-5)(x-4)
=6x²-7x-3-(6x²-29x+20)
=6x²-7x-3-6x²+29x-20
=22x-23
=22×(-2)-23
=-44-23
=--67
35-102=67
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