根据X加X加X加Y加Y=54,X加X加Y加Y加Y=56
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/11 21:22:59
Y=80X=240再答:过程X=3YX+Y=320再答:4Y=320再答:Y=80
(x²+y²+1)(x²+y²+3)=8(x²+y²)²+3(x²+y²)+(x²+y²)
原式=(x+2y)^2-(x+2y)+1/4=0则x+2y=1/2
X²+4X+Y²-6Y+13=0X²+4X+4+Y²-6Y+9=0(X+2)²+(Y-3)²=0X=-2,Y=3
x平方加y平方减2xy减6x加6y加9=0x^2+y^2-2xy-6x+6y+9=0(x^2+y^2-2xy)-6(x-y)+9=0(x-y)^2-6(x-y)+9=0(x-y-3)^2=0x-y-3
题在哪
根据均值不等式x+2y≥2√[x*(2y)]=2√(2xy),当且仅当x=2y取等两边平方得(x+2y)^2≥8xy……(*)将x=2y代入x+2y+2xy=8得x+x+x^2=8x^2+2x-8=0
x^2+16y^2+4x+4y+5=0x^2+4x+4+4y^2+4y+1=0(x+2)^2+(2y+1)^2=0因为x^2>=0所以x+2=02y+1=0所以x=-2y=-1/2
x^2-2x+y^2+8y+17=0(x-1)^2+(y+4)^2=0x=1;y=-4;
是(x-y)分之(x+y)*(x+y)分之(x-y)如果是,那么:(x-y)分之(x+y)*(x+y)分之(x-y)=1
2+x^2+(x^2)*(y^2)=2X-2xy,化简得:(x-1)^2+(xy-1)^2=0【把化简前式子中的2分成1+1】所以x-1=0,xy-1=0,得x=y=1【(x-1)^2是(x-1)的平
x=8,y=15.(诚心为你解答,给个好评吧)
由已知得(X-2)^2+(2Y+1)^2=0则X=2,Y=-1/2代入计算即可(后面的表达式看不大清楚)
x^2+xy+y^2=0x/y=-1/2+√3/2i或-1/2-√3/2i对应:y/x=-1/2-√3/2i或-1/2+√3/2i原式=(-1/2-√3/2i)^998+(-1/2+√3/2i)^99
由题意可得x²+y²+2x+6y+10=0(x+1)²+(y+3)²=0所以x=-1,y=-3
(x-y)(x+y)+(x-y)(x+y)=2*(x-y)(x+y)=2(x^2-y^2)=2x^2-2y^2
x+x+x+y+y=54x+x+y+y=46x+x+x+y+y-(x+x+y+y)=54-46=8x=8所以16+2y=462y=30y=15所以x=8,y=15另外发并点击我的头像向我求助,请谅解,
3x+2y=542x+3y=465x+5y=54+46=100x+y=20
根据题目:3x+y=68①x+3y=44②(①+②)÷4x+y=28x=(68-28)÷2=20y=28-20=8