思考题解答 5={2m,n,6+p以，且有≠0. 5.k=0,5.i=0, ∫6+p=0 → 2m=0 小n=-6,m=0, .5≠0，.n≠0， 故当m=0,n≠0，p=-6时结论成立.思考题解答 s = {2m,n,6 + p},  且有 0.   s  s  k = 0,    s  i = 0,      = + =  2 0 6 0 m p  p = −6, m = 0, 0,    s  n  0, 故当 m = 0, n  0, p = −6 时结论成立．