原式=[(2x²-18)/(4-4x+x²)]³÷[(3-x)/(-2-x)]²=[2(x²-9)/(x-2)²]³÷[(x-3)/(x+2)]²=[2³(x²-9)³/(x-2)^6]×[(x+2)²/(x-3)²]=[8(x+3)³(x-3)&#...