A:3000
B:3570
C:275
D:276
Which of the following underlined parts is different in pronunciation from others?
一桶油用去它的 15 后,剩下的比用去的多。
已知集合M={x|x2+ax+b=0,x∈R}.
(Ⅰ)若集合M是单元素集,求实数a,b满足的关系式;
(Ⅱ)若1,3∈M,求实数a,b的值.