【简答题】(1)已知椭圆C: x 2 a 2 + y 2 b 2 =1(a>b>0) 的离心率为 6 3 ,椭圆C上任意一点到椭圆两焦点的距离和为6.求椭圆C的方程; (2)直线l:y=kx+1与双曲线C:2x 2 -y 2 =1的右支交于不同的两点A、B.求实数k的取值范围.
【简答题】Are you a compulsive spender,or do you hold on to your money as long as possible? Are you a bargain hunter? Would you rather use charge accounts than pay in cash? Your answers to these questions will ...
【简答题】Are you a compulsive spender, or do you hold on to your money as long as possible? Are you a bargain hunter? Would you rather use charge accounts than pay cash? Your answers to these questions will re...
【单选题】If the supply of money is greater than the amount of money people want to hold, then
A.
spending will increase and the price level will fall.
B.
spending will increase and the price level will rise.
C.
spending will increase and the rate of interest will rise.
D.
non of the above; the amount of money supplied is never greater than the amount people want to hold.
【单选题】Are you a compulsive spender, or do you hold on to your money as long as possible? Are you a bargain hunter? Would you rather use charge accounts than pay cash.* Your answers to those questions will r...
A.
Because people can buy love with money.
B.
Because people spend money to express love.
C.
Because money is basic to love.
D.
Because when people express love, they must use money.
【单选题】According to the passage, if incomes and prices rise together ______.
A.
money will hold its value
B.
inflation is still a trouble
C.
inflation will not be a problem
D.
businesses will be prosperous
【简答题】已知椭圆方程为 x 2 6 + y 2 3 =1,则其离心率为______.
【单选题】People forgo interest and hold money:
A.
because they are required to.
B.
to reduce their transactions costs.
C.
because there are no substitutes for money.
D.
because banks are too risky.
【判断题】电话售票员女性上班期间可以化浓妆,对方也看不见。( )