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【简答题】
编写程序,实现从键盘上输入三角形的 3 条边,输出三角形的面积。三角形的面积计算公式为: 其中, s=(a+b+c)/2 。 2. 求出 100~300 之间的所有平方被 6 除余数为 3 的奇数。 3. 输入一个正整数,显示其所有的因子。在此基础上,求出 1~100 之间的完全数。完全数是刚好等于它的因子(自己本身除外)之和的数。如, 6 的因子为 1 , 2 , 3, ,且 6=1+2+3 ,因此 6 是一个完全数。
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反馈参考答案：
举一反三
【单选题】When the economy is in recession, jobs are generally harder to find and more people go to college. We can conclude that the opportunity cost of
A.
going to college decreases when the economy is in recession.
B.
going to college increases when the economy is in recession.
C.
working increases when the economy is in recession.
D.
working is zero when the economy is in recession.
【单选题】In a recession when income and wealth are falling, the demand for bonds _________ and the demand curve shifts to the _________.
A.
falls; left
B.
falls; right
C.
rises; right
D.
rises; left
【判断题】A recession occurs when real GDP declines for two successive quarters in a row
A.
正确
B.
错误
【单选题】When the national economy is faced with a recession or high inflation, the government engages in active policies with timely attempts to move the economy back ______.
A.
with the right track
B.
on the right track
C.
for the right track
D.
in the left track
【单选题】Bill is a high-school drop out who lost his job in a fast food restaurant when the economy plunged into a recession. After 8 months, Bill is still looking for work. He is an example of
A.
frictional unemployment.
B.
structural unemployment.
C.
cyclical unemployment.
D.
the natural unemployment rate
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