即(x^4+4x³-ax²-4x-1)-2能被x+3整除射 商是A则(x^4+4x³-ax²-4x-1)-2=A(x+3)x=-3,则x+3=0右边等于0所以左边也等于0x=-3(x^4+4x³-ax²-4x-1)-2=81-108-9a+12-1-2=09a=-18a=-2...