(-2x-1)²-4(2x-1)²-2(2x+3)(2x-1)
=(2x+1)²-4(2x-1)²-2(2x+3)(2x-1)
=(2x+1+2(2x-1))(2x+1-2(2x-1))-2(2x+3)(2x-1)
=(6x-1)(-2x+3)-2(2x+3)(2x-1)
=-12x^2+18x+2x-3-8x^2+4x-12x+6
=-20x^2+12x+3
(-2x-1)²-4(2x-1)²-2(2x+3)(2x-1) 因式分解及簡(jiǎn)便運(yùn)算
(-2x-1)²-4(2x-1)²-2(2x+3)(2x-1) 因式分解及簡(jiǎn)便運(yùn)算
數(shù)學(xué)人氣：668 ℃時(shí)間：2020-05-24 14:27:54
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