(1)向量a與向量b共線,
則由共線條件,-1*1/x=(x²+m)(m+1)
當(dāng)x=-1時(shí),1=(m+1)²
m=0或-2
(2)a*b=-m-1+(x²+m)(1/x)=-m-1+x+m/x＞0
(x-m)(x-1)/x>0
若x>0,則x>max{m,1}
若x0,則(x-m)(x-1)/x>0此時(shí)恒不成立
綜上,x>max{m,1}