x的4次方-13x的平方+36 =X^4-13X^2+36=(X^2-4)(X^2-9)=(X+2)(X-2)(X+3)(X-3) 2x的4次方-7x的平方-4 =2X^2-7X-4=(2X+1)(X-4) 3x的3次方+6x平方y-3x平方z-6xyz=3X^3+6X^2Y-3X^2Z-6XYZ=3X^2(X+2Y)-3XZ(X+2Y)=3X(X+2Y)(X...