已知2016x加y的平方与2分之一x加2分之3y减一的绝对值-搜答案-智慧作业帮

1/2再答：再问：谢谢了，问题解决了

先把求的式子化简,得：十二分之一a³加b平方因为与x取值无关,所以2x²+ax-2bx²+3x=0求得b=1,a=-3代入,原式=-5/4

xy+x²+y²=[(x+y)²-(x-y)²]/4+[(x+y)²+(x-y)²]/2=[3(x+y)²+(x-y)²

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

1.x^2+y^2=(x+y)^2-2xy=4-1=3(x-y)^2=(x+y)^2-4xy=4-2=22.(a+b)^2=7a^2+b^2+2ab=71式(a-b)^2=3a^2+b^2-2ab=3

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

再答：

再问：是这样的吗再答：是

x^2+y^2+4x+2by+b^2=0(x^2+4x+4)+(y^2+2by+b^2)=4(x+2)^2+(y+b)^2=4圆心坐标为(-2,-b),半径为2圆x轴相切∴|b|=2∴b=±2

x²-xy=9,xy-y²=3x²-y²=(x²-xy)+(xy-y²)=9+3=12x²-2xy+y²=(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

由柯西不等式有：(4X+3Y)^2

问题求什么?再问：求x加y的值再答：x^2-2x+1+y^2-6y+9=0(x-1)^2+(y-3)^2=0x=1y=32x+3y=11

x+y-2=x^2+axy+by^2-5x+y+6x+y-2是x^2+axy+by^2-5x+y+6的因式当x+y-2=0时,x^2+axy+by^2-5x+y+6=0令x=y=1,x+y-2=0x^

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

x^2+2x+x^2y^2+2=-2xy,移项得x^2+2x+x^2y^2+2+2xy=0,凑平方得（x+1)^2+(xy+1)^2=0,于是得到x=-1,xy=-1,进一步得到y=1,于是,x^20

（x+y）平方=x平方+2xy+y平方=13（x-y）平方=x平方-2xy+y平方=9两式相加得2（x平方+y平方）=22,x平方+y平方=11两式相减得4xy=4,xy=1

x的平方加y的平方加2x-6y+10=0即：(x+1)^2+(y-3)^2=0所以：x=-1,y=3.所以：x+y=2.

y=k(x^2+1)x=2y=10代入得：K=2故：y=2(x^2+1)再问：我想要一下过程，那个^是什么呀？再答：x的平方

由题意可得x²+y²+2x+6y+10=0（x+1）²+（y+3）²=0所以x=-1,y=-3