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若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使...若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2 数学

(a+1)x减3,1}求(1

对两条不相交的空间直线a与b,必存在平面必存在平面R,使得：a垂直于R,b垂直于R.这个结论为什么错? 数学

英文字母概念好的帮忙一下...T、H、C、N、E、O、I让你联想到什么（词）?要有意思的词,不是的...我的意思是用T、H、C、N、E、O、I组成一个词...比如说TOHECIN类似的词，而且要有意思的词，我语文

∵∴咋写?1:∵a=b(已知),c=d(已证)∴r=x()2.{a=b()∵{c=d(){r=q(){1=1()∴{x=r(){z=w()哪个对? 数学

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--- “What will you do during the summer holiday?” --- “I don’t know,but it’s high time _____ something.” A：I’m deciding B：I’ll decide 其他

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At The End Of The Sky 译中文 Oh Darling I found a way across the skyFound a way that I could flyTo the origin of timeI rewound to a place 英语

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