【简答题】【消耗次数:1】
自然数里,a=2,f (x,y)=x+y,g (x,y)=x·y,F (x,y): x=y。公式“$xF(f(x,x),g(x,x))”的真值:[填空1]
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相关题目
【判断题】 自然数里,a=2,f (x,y)=x+y,g (x,y)=x·y,F (x,y): x=y。公式“xF(g(x,a),x)”的真值为真。
①  正确
②  错误
【简答题】 自然数里,a=2,f (x,y)=x+y,g (x,y)=x·y,F (x,y): x=y。公式“xy(F(f(x,a),y) ?F(f(y,a),x))”的真值:[填空1]
【判断题】 自然数里,a=2,f (x,y)=x+y,g (x,y)=x·y,F (x,y): x=y。公式“xy(F(f(x,a),y) ?F(f(y,a),x))”的真值为假。
①  正确
②  错误
【简答题】 实数集合里,a =0,f (x,y)=x-y,F(x,y): x=y, G(x,y): xy。公式“xy(G(x,y) ??F(f(x,y),a))”的真值:[填空1]
【简答题】 实数集合里,F(x,y): x=y, G(x,y): xy。公式“xy(G(x,y) ??F(x,y))”的真值:[填空1]
【判断题】 实数集合里,a =0,f (x,y)=x-y,F(x,y): x=y, G(x,y): xy。公式“xy(F(f(x,y),a) ?G(x,y))”的真值为假。
①  正确
②  错误
【单选题】 自然数里,a=2,f (x,y)=x+y,g (x,y)=x·y,F (x,y): x=y。公式“<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/117E6A630A0200497B87D15B90307923.png data-tex=\exists />xF(f(x,x),g(x,x))”的真值:
①  0
②  1
③  2
④  不确定
【单选题】 自然数里,a=2,f (x,y)=x+y,g (x,y)=x·y,F (x,y): x=y。公式“<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/151E88A53D653382F547CC2EA5D9CEBC.png data-tex=\forall />xF(g(x,a),x)”的真值:
①  0
②  1
③  2
④  不确定
【判断题】 公式“x$y(F(x, y) ù G(y, z)) ú $xH(x, y, z)”中的全称量词x的辖域为:$y(F(x, y) ù G(y, z)) 。
①  正确
②  错误
【单选题】 在公式()F(x,y)→(y)G(x,y)中变元x是(   )
①  自由变元
②  约束变元
③  既是自由变元,又是约束变元
④  既不是自由变元,又不是约束变元
随机题目
【单选题】 Haven’t seen you for ages! What are you busy doing now?____________
①  I hate the weather here.
②  My hair is getting a bit longer.
③  I am working part time in a bookshop, you know.
④  Yeah, thanks for coming.
【单选题】 We are planning an outing. _________ Sure.
①  Where are you going?
②  When will you leave?
③  How is everything?
④  Do you want to join us?
【单选题】 It is dangerous to ______ outdated(过时的) ideas and theories.
①  cling to
②  strive for
③  run through
④  resort to
【单选题】 I had my meals ______ when I was ill in bed with a bad cold.
①  to bring
②  bring
③  brought
④  bringing
【单选题】 Don’t make faces in class.____________
①  Excuse me, I am wrong.
②  Certainly, I will.
③  That’s OK.
④  Sorry, I won’t do it again.
【单选题】 He offered to ___ her a hand as the suitcase was too heavy for her to carry.
①  lend
②  help
③  grant
④  loan
【单选题】 Our new house is very ____ for me as I can get to the office in five minutes.
①  adaptable
②  convenient
③  available
④  comfortable
【单选题】 Have you any oranges and apples?____________
①  The oranges are very cheap.
②  You like apples, dont you?
③  Of course, we have some fruits.
④  Yes, madam, on the second shelf over there.
【单选题】 the old couple decided to ____ a boy and a girl though they had three of their own.
①  adapt
②  bring
③  receive
④  adopt
【单选题】 I will count three hundred and not one of you ______ move a bit.
①  is to
②  are to
③  is
④  are