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(x-3)^2+2xy+2y^2=0 求x/y （x-8）/2.4=12 12（x+2）=（12+8）x 化学必修1习题高一化学必修一第38面关于氧化还原反应的习题, 已知二次函数x^2-ax+b=0的两根分别为sinβ和cosβ,求P（a,b)的轨迹方程.我算到了sinβ + cosβ = asinβ * cosβ = b第一个式子平方1 + 2 sinβ * cosβ = a^2所以1 + 2b = a^2b = (a^2 -1)/2 she can look after you.同一句是什么? 有化学王后雄学案鲁科版必修二的进第16 页的右下角那道的D选项是什么意思已知短周期元素的离子A2+，B+,C3-,D-(核电荷数分别为abcd)都具有相同的电子层结构，则 判断：单质的还原性：A>B>D>C. identity&recognize有什么区别? identity 和 personality的区别Parents,your teen is forming their ______ and they need to know that you respect them as an individual 这句话中为什么选identity 而不选personality similarity和identity不同吗?Biometric access-control system work by degrees of similarity,not by identity. ELISA试剂盒请问一下国产的试剂盒哪个公司的做出来的效果好 是不是试剂盒只能做一次 人教版初中语文课后的所有字词注音当做次好人 you should look after you h_______ Simon,you should learn to look after -----------(you) is ( )eraser.You should look after it .1your 2you 3a 4yours what happend while Linda was on the telephone while不是不可以用在句中吗 You should learn to look after yourself well.改为同You should learn to look after yourself well.改为同义句You should learn to ______ _______ _______ _______ yourself. what happend while Linda was on the telephone 中was on the phone讲解一下好吗 you should look after your pet well.you should _____ ______ ______ ______ your pet.you don't need to finish your homework now.you ______ ______ _______finish your homework now.the little dog is hunting for its owner.the little dog is ____ _____for it What happened while Linda was on the telephone什么意思 What happened while Linda was on the phone?为什么不是What did happen while Linda was on thephone请详解此类情况, 数列.第十五题第二小题 高一数列题(+15)数列{An}满足A1=1,A(n+1)=An+2(1)设Bn=1/An·A(n+1),求数列{Bn}的前n项和Sn(2)求数列{An·P^n}(P>0)的前n项和Tn 新闻报道怎么写?发个例文,关于中秋节的.300字 清明节随想范文300字左右 英语的动词不定式题目I‘m going to the library_____the books.A.return B.borrow C.to return D to lend选那个,为什么?It is no use_____（talk）with her.还是要详细说法The old watch need_____（repair）I must apolgize for not_____ 动词不定式!动词不定式是?我一直不懂什么动词ing和to 接动词原形等不等? 王老师光容的被评为全国:劳动模范:的称号.该病句. 修改病句：李阿姨被评为市劳动模范的称号.修改病句：李阿姨被评为市劳动模范的称号. 人教版初中语文课后词语及解释,要全哦,谁有?帮帮忙 What h_ while Linda was on the telephone?横线上应该添什么 已知x的平方+2m-1=0,求m+1/m的平方急死啦啊啊啊啊啊啊啊啊啊啊啊啊啊！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！