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已知x²+4y²-4x+4y+5=0,求：(x^4-y^4)/[(2x-y)(x+y)]*(2x-y)/(xy-y²)/[(x²+y²)²/y²] 已知x²+4y²-4x+4y+5=0,求2x²+xy-y²分之x的4次方-y的4次方×xy-y²分之2x-y÷（y分之x²+y²）²的值. 请问这道虚拟语气的英语选择题怎么做?Had I known about this computer program,a huge amount of time and energy_____. A.would have been saved B.had been saved C.will be saved D.was saved请说一下理由? The thief closed his eyes___he___dying.A.even if;as B.though;would be C.when;had been D.as if;were 3、求英语选择题答案?虚拟语气相关.31. If the whole program _____ beforehand, a great deal of time and money would have been lost.A. was not planned B. were not planned C. would not be planned D. had not been planned32. Isn’t it abo 2x的二次方=18 x=? x的2次方—2x+18中,它的项分别是 x分别取1,2,3,4,5这五个数时,代数式(x-1)(x+2)*(x-3)的值为0的有几个 已知实数,x、y、z满足x+y+z=1,求x²+4y²+9z²的最小值 二战全面爆发的标志是德国突袭波兰还是英法对德宣战 小兔子要怎样说才不会被狮子吃掉【三年级暑假作业】 急 急 急 急 已知向量a的模为10,b的模为12,且3a与1\5b的积为-36,则a向量与b向量的夹角是多少? 已知｜向量a｜=10,｜向量b｜=36,且（3*向量a）*（-1/5*向量b）=108,则向量a与向量b的夹角是?等1个小时 数学的填空题分哪些类型请再举个例 数学填空题（在线30分钟）平方得9的数有（ ）个,分别是（ ）. 英语选择题（虚拟语气）_______,you would have seen my nephew - a very outstanding and promising boy.A.If you had arrived earlier B.If you arrived earlierC.Did you arrive earlier D.Unless you had arrived 英语的虚拟语气(选择题)It's time that you ( ) home and I'd rather you ( ) again tomorrow.A.would go,would come B.went,came C.go,are coming D.are going,will come为什么这里要用虚拟?后面一空不用过去将来时吗?有tomor 英语有关虚拟语气的选择题the lift wasn't working when i came back last night.if it ______ ,i would have to use the stairs.a.is still not working b.was still not working c.were still not working d.would still not working 希望有句子翻 如过有三只羊和三只狼,要让它们过河,如果羊比狼少的时候,狼会吃羊,怎样才能让它们 当X( )时,代数式6分之4-X的值大于三分之一 请问,1939年9月德国入侵波兰,英法为什么被迫对德宣战?另外请问,英法为什么坐视波兰灭亡? 为什么德国进攻波兰会导致英法对德宣战 三只狼、三只羊过河,船上必须有一 只羊,船上最多能有两只动物,狼比羊多 时,狼会吃羊,该怎样过河? 有三只羊和三只狼,牧人要带他们过河.每次必须要带一只,一次最多带两只.当狼的数量超过羊时,羊会被吃掉.回来时也要带羊或者狼的 数轴上A点表示负3.BC两点表示的数互为相反数,且点B到点A的距离是2.则点C表示的数应该是多少? 求问概率论的几道题后天交作业,但这3道题目不会做TT有会做的麻烦教下啦!哪怕提示下也好!~ 进行4次重复独立试验,如果试验成功3次于成功4次的概率相同,求4次试验中至少成功1次的概率? 对角矩阵的逆矩阵 分块对角矩阵求逆 证明分块对角矩阵的逆等于其各个非零子块分别求逆,请问这条性质应该如何证明, 什么是对角矩阵 在线等答案~~~~英语完型~~~1. Music is part of every culture on Earth. Many people feel that music makes life worth___1___. We can make music ourselves if we play an instrument or sing. We can hear music on CDs and on radio or television. Mus 英语 完型