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若x=6,y=-二分之一,z=1,是方程ax-6y=33 3x+by=16 2x-4y=cz的解,则a=,b=,c= 解下列三元一次方程组x+3y=3,y+3z=-3分之17,x+z-6y=-3 三元一次方程{3x+y-z=12,x+6y-3z=0,5x-y-z=8 求方程y=√x^2+2x+2+√x^2-6x+13的最小值,并求对应的x,y的值 已知三条直线L1：y＝x ,L2：2x＋y－2＝0,L3：x＋2y...已知三条直线L1：y＝x ,L2：2x＋y－2＝0,L3：x＋2y＝0,求这三条直线所围区域面积 方程x^2-2x+k=0的两个实根为a、b 当k变化时,求f(x)=a^2+b^2 的最小值 aX^2+bY^2+cX+dY=0因式分解 (ax+by)^(cx+dy)导数 ax+by=m cx+dy=n 求x,y值? 鲁国之法习题答案 消去法的例题与答案5辆自行车和2辆摩托车总价9500元,2辆自行车和5辆摩托车总价20600元,自行车和摩托车的单价各多少?用二元一次方程解 已知x+y+z=0,求(y²+z²-x²)分之1+(z²+x²-y²)分之1＋（x²＋y²－z²）分之1的值阿里嘎多 已知x+y+z=0,则y²+z²-x²分之1+z²+x²-y²分之1+x²+y²-z²分之1=______. 已知x=y+z+2,x²=y²+z²+2yz+200试求（1）x+y+z的值（2）x的值 .(29 13:9:48)弹簧秤下挂一物体浸没在水中时,弹簧秤的示数是物体在空中时弹簧秤的示数,这个物体的密度是?  已知实数x,y满足方程x2+(y-1)2=1/4求根下(x-2)2+(y-3)2的取值范围 四个0如何成24点,方法多多益善 ps:请管理员不要推荐,好的我自己采纳! (1/3)^x=8 x=? x^8/(-x) 物质 (10 10:28:59) ＿不同的物质都是由不同的分子组成的,分子模型的特点有：（1）＿＿＿,（2）＿＿＿,（3）＿＿＿. 另一题：已知函数f(x)=2lnx+x2/a(a大于0）若当X属于（0,正无穷大）时,f(x）大于等于2恒成立,则实数a的取值范围是多少 已经函数f(x)=lnx-a2x2+ax(X属于R)若函数f(x)在区间[1,正无穷大）上是减函数,则实数a的取值范围是多少 有些符号打不出来用汉字代替的 若a=20062006/20072007b=20072007/20082008c=20082008/20092009比较abc 试求20072007-2*20062006+20082008条件 设a=2007007/20082008,b=20082008/20092009,c=20092009/20102010,比较a,b,c的大小 如图,平行于x轴的直线AC分别交抛物线y1=x2（x≥0）与y2= x23（x≥0）于B、C两点,过点C作y轴的平行线交y1于点D,直线DE∥AC,交y2于点E,则 DEAB= 大家帮帮·忙·啊 直接写出x的值6x+3=21 3x-2X4=16 2x+7=55 6x-3X8=24 5x+27=52 6+0.7x=83 33+8x=97 7x-3X7=28 51+4x=95 9x-4X6=48 求英语高人帮我解答下面几个问题,用英语回答,高中水平就可以,1.what places have you been to?which one impresses you most?2.Do you know anything about thailand what is the climate like there?3.if you've got a chance to travel ab 请用英文回答下面几个问题Crazy loveI met her when i was16.a common"FRIEND"introduced us.Did she like me?yes,she did.Did i like her?No,i didn`t like her.I loved her.It was passion,love at first sight.she really drove me crazy.And i didn`t k 求英语达人帮忙回答以下几个问题?第一题.Needs analysis is very applicable in situations where students have very specific language needs.However,it can also be used in situations where learners’ needs are not so specific,as in the c 帮我用英语回答下面几个问题 1,Did you often hava visitors来宾 when you were at home?how dou you entertain(招待.) them2,what should we do to keep healthy,3,Is it a good practice for friends,to seng each other greeting cards during impo 若实数X,Y满足X*X+Y*Y-2*X+4*Y=0,求X-Y的最大值.给个过程额..答案上课已经讲过了...我因为太困结果睡着了没听到过程