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一道数学逻辑题.上海教育出版社八年级寒假生活20页的.内容如下.ABCDE五人进行游泳比赛,赛后我向他们询问比赛情况.A说“D第二,我第三”B说“我第一,C第二”C说“B是最后一名,我得第三”D说 发动机后五位数是什么意思 将一个五位数保留到百位是什么意思? 设点A(2,-1),点B(4,m).(1),求m的值使向量AB的模最小,并求此最小的模.(2)点C在二次函数y=x平方+1的图象上,当向量AC与向量a=(1,-1)平行时,求点C的坐标 确定函数y=x-1/x在区间（﹣∞,0）上的单调性,并用定义证明 确定函数y=x+(1/x)的单调区间,并用定义证明(x>0) 已知函数f(x)的定义在(负无穷,正无穷)上的奇函数,当X属于(负无穷,0)时,F（X）=x-x的四次方,则当x＞0,F(x)=? 最早的计算工具是：（） 请给个答案!A、电子计算机B、机械式计算机C、对数计算尺D、算盘 在14世纪发明的计算工具是什么 人类最早的计算工具 如图,如果∠ADC=87°,那么∠A、∠B、∠C三个角的和为多少度, 怎么运用换元法解答数学问题 √(x2+2)/x+√x/(x2+2)=5,只知道令第一个根式为y,后面x求不出 No man is born ( ), we need to learn to become ( )A wise wise B wisely wise 已知定义在R上的函数f(x)=(-2的x次方+1)/(2的x次方+a)是奇函数 (1)求a的值 (2)若对任意的t属于R,不等式f(t²-2t)+f(2t²-k)＜0恒成立,求k的取值范围 How many phyla make up a majority of the animal kingdom?回答不限语言~ 英语“the skirt made up for feathers of many 10.About how many elements ____make up most of the substances we meet in everyday life?About how many elements ____make up most of the substances we meet in everyday life?A.it is that B.it is whichC.is it thatD.is it which用which,还是用that是怎 三个连续奇数的和为15,设中间一个为x,则可列方程为 i was born_____,1982 A.on June 2 B.on june 2rd C.ON june two Jim's brother born on june 2nd,1997 改错 I was born june 2nd 1992 还是 I was born 2nd june 1992 还是I was born on 2nd june 1992 我搞糊涂了 这几个 帮我弄个最地道 的说法 有甲乙两个班甲班人数占两个班总人数的九分之四.如果甲班与乙班人数的比是（）,甲班比乙班人数少.（）%,乙班比甲班多两个班总人数的（）,如果甲班比乙班人数少八人那么两个班共有（ ①7/13÷7+1/7*6/13②7/11*1/7*10/7*7/11 （111+999）÷【56×（7分之3－8分之3）】1又4分之1－20分之9+30分之11－42分之13+99995分之4 What realistic changes would you make to your country's attitude toward education? I want to touch your the country of your mind Remember to make your bed.(同义句) _____ _____ to make your bed. What realistic changes would you make to your country's attitude toward education?不是要翻译,是你的回答用英语 thanks he__(born) disabled填空 he was born 分析英语句子分析一下这个句子为什么不能直接用 he born 不是一个主语 一个谓语 复合句子结构 非要加个was 那么was后不是加doing 一张卡片上写一个四位数,陈老师给同学们看的时候拿倒了,看上去还是一个四位数,原来是几?后来的四位数比原来的四位数小6993.