A:would have been done
B:would be done
C:were to do
D:were done
用反证法证明:若二次方程8x2﹣(k﹣1)x+k﹣7=0有两个不等实数根,则两根不可能互为倒数.
某居民在银行存入20000元的三年期定期存款,年利率为3.25%,到期取出,该居民获得的利息是( )