由于在零点处导数不一定为0,因此用导数不方便,只能得到零点的范围,不容易直接求零点.x³-2x²-x+2=0x³-x²-x²+x-2x+2=0x²(x-1)-x(x-1)-2(x-1)=0(x-1)(x²-x-2)=0(x-1)(x-2)(x+1)=0x=...