已知x加y等于ax的平方加y的平方
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1/2再答:再问:谢谢了,问题解决了
x的平方-4x+y的平方+2y+5=x的平方-4x+4+y的平方+2y+1=(x-2)^2+(y+1)^2=0x-2=0x=2y+1=0y=-1x+y=2-1=1
X²+Y²=10..(1)X+Y=6..(2)(2)²-(1)得2XY=26XY=13如果认为讲解不够清楚,
x^2+2x+y^2-6y+10=0=(x^2+2x+1)+(y^2-6y+9)=0=(x+1)^2+(y^2-6y+3^2)=0=(x+1)^2+(y-3)^2=0x=-1y=3xy=-3
再问:姐姐,你多大啦,再答:20再问:哦哦,你家在哪呀,你当我姐姐好不好,?再问:^ω^再问:姐姐,你不说话我就当你默认了哈,!哈哈,姐,!再答:O(∩_∩)O再答:姐姐现在比较忙哦再问:
x^2-2x+y^2+6y+10=0x^2-2x+1+y^2+6y+9=0(x-1)^2+(y+3)^2=0x-1=0,y+3=0x=1,y=-3(x-y)/(x+y)=4/(-2)=-2
x^2+y^2=6y-4x-13x^2+4x+4+y^2-6y+9=0(x+2)^2+(y-3)^2=0x=-2y=3x^2-y^2=(-2)^2-3^2=4-9=-5
(x+y)²=20,∴x²+y²+2xy=20(x-y)²=40,∴x²+y²-2xy=40两个式子相交得2(x²+y²
x²+y²=(x+y)²-2xy=64-24=40再问:能讲一下解法吗?说了我加分再答:(x+y)²=x²+y²+2xy呀那x²+
x方+y方+5/4=2x+y(x方-2x+1)+(y方-y+1/4)=0(x-1)方+(y-1/2)方=0x=1,y=1/2xy/(x+y)=1/3
x^2+4x+y^2-2y+5=0(x^2+4x+4)+(y^2-2y+1)=0(x+2)^2+(y-1)^2=0x=-2,y=1x^2+y^2=(-2)^2+1^2=4+1=5
由x+y=25x+y=7则(x+y)=x+y+2xy=7=492xy=(x+y)-(x+y)=49-25=24则(x-y)=x+y-2xy=25-24=1因为:x<y所以x-y<0即x-y=-1
(ax+y)的平方=a²x²+2axy+y²=9x²+mxy+y²,则a²=9,2a=m则a=±3,m=2a则m=±6
已知:x等于负2013,y等于2012代数式x平方加2xy加y平方的值=(x+y)²=(-2013+2012)²=1;手机提问的朋友在客户端右上角评价点【满意】即可.
x^2+y^2+a^2+b^2=2移项:即2>=2ax+2by所以ax+by=
(x-2y)²=(x²-4xy+4y²)=(x²+4xy+4y²)-8xy=(x+2y)²-8xy∴A=-8xy或者记住(x减2y)的平方-
根据(x+y)2=x2+y2+2xy,可得x2+y2=13