题目内容
（请给出正确答案）
● 算术表达式x-(y+c)*8的后缀式是（22）（-、+、*表示算术的减、加、乘运算，运算符的优先级和结合性遵循惯例）。 A. x y c 8 - + * B. x y - c + 8 * C. x y c 8 * - + D. x y c + 8 * -
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“● 算术表达式x-（y+c)*8的后缀式是（22）（-、+、*表示算术的减、加、乘运算，运算符的优先级和结合性遵”相关的问题
x+a×(y-b)-z/f
其中的算术运算符遵循先乘除后加减的运算规则。则上述表达式的前缀表示为( )， 后缀表示为( )。
A.bc–d*a+
B.abc–d*+
C.ab+c–d*
D.abcd–*+
Project after project designs a set of algorithms and then plunges into construction of customer-deliverable software on a schedule that demands delivery of the first thing built．
In most projects,the first system built is （71） usable,It may be too slow,too big,awkward to use,or all three．There is no （72） but to start again,smarting but smarter,and build a redesigned version in which these problems are solved．The discard and （73） may be done in one lump,or it may be done piece-by-piece．But all large-system experience shows that it will be done．Where a new system concept or new technology is used,one has to build a system to throw away,for even the best planning is not so omniscient（全知的）as to get it right the first time．
The management question,therefore ,is not whether to build a pilot system and throw it away．You will do that．The only question is whether to plan in advance to build a （74）,or to promise to deliver the throwaway to customers．Seen this way,the answer is much clearer．Delivering that throwaway to customers buys time,but it does so only at the （75） of agony（极大痛苦）for the user,distraction for the builders while they do the redesign,and a bad reputation for the product that best redesign will find hard to live down．
Hence plan to throw one away;you will,anyhow．
71.()
A.almost
B.often
C.usually
D.barely
A.R.B= S.B AND R.C = S.C AND R.C＜S.B
B.R.B= S.B AND R.C = S.C AND R.C＜S.F
C.R.B= S.B OR R.C = S.C OR R.C＜S.B
D.R.B= S.B OR R.C = S.C OR R.C＜S.F
（）A. P0P1P2P3P4 B. P2P0P1P3P4 C. P1P0P2P3P4 D. P3P0P1P2P4
A．规模度量
B．数据验证
C．适应性修改
D．正确性测试
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
