10x平方 y平方-2x 4y 5=0
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81(x+y)²-121(m+n)²=[9(x+y)]²-[11(m+n)]²=(9x+9y)²-(11m+11n)²=[(9x+9y)+(
原式=(x+y)(x-y)/(x-y)^2=(x+y)/(x-y)=120/100=1.2^2指平方
(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)=(x+y)(x-y)/(x+y)+(x-y)^2/(x-y)=x-y+x-y=2(x-y)
2x+2y+z=0(1)5x+4y-4z=0(2)(2)-(1)*2得x=6z把x=6z代入(1)得y=-13z/2把x=6z,y=-13z/2代入3x平方-4y平方+5z平方/x平方+6y平方-10
15/16再问:要过程,这位大姐再答:由已知得X=﹣4/3Y,Z=﹣2/3Y,带入可得15/16再问:怎么得出再答:解方程组,①式*4+②式得x=-4/3y,代入①得z=-2/3y,再将x,z代入代数
X²-2X+Y²+6Y+10=0X²-2X+1+Y²+6Y+9=0(X-1)²+(Y+3)²=0X-1=0,X=1;Y+3=0,Y=-3(2
x^2+y^2-6x+2y+10=0(x^2-6x+9(+(y^2+2y+1)=0(x-3)^2+(y+1)^2=0因为(x-3)^2≥0,(y+1)^2≥0因此x-3=0,x=3y+1=0,y=-1
x平方+y的平方-4x-10y+29=0(x-2)²+(y-5)²=0要是它成立,必有x=2,y=5x平方y的平方+2x立方y平方+x的4次方y平=4×25+2×8×25+16×2
(3xy)平方/(-xy)+(x-2y)平方-(x+2y)(x-2y)=-9xy+(x-2y)(x-2y-x-2y)=-9xy+(x-2y)(-4y)=-9xy-4xy+8y²=8y
(3x平方-4y平方)+[-(x平方-2xy-y平方)]-[(3x平方-2xy-y平方)]=3x²-4y²-x²+2xy+y²-3x²+2xy+y
(y+1)平方-2x平方(1+y平方)+x四次方(1-y)平方=(y+1)²+2*x²*(y²-1)+[x²(y-1)]²-2x²(y
x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x=(x-2y)(x+2y)/(x+y)²·x(x+y)/(x+2y)=x(x-2y)/(x+y)
x²-4x+y²-10y+29=0x²-4x+4+y²-10y+25=0(x-2)²+(y-5)²=0∵(x-2)²≥0,(y-5
化简:(xy)^2-10xy+25+y^2-4y+4=0∴(xy-5)^2+(y-2)^2=0∴xy=5,y=2∴x=2.5代入,得:x^2y^2+2x^3*y^2+x^4*y^2=150+625/4
x平方+y平方-6x+2y+10=0,(x-3)^2+(y+1)^2=0因为:(x-3)^2>=0,(y+1)^2>=0所以:x-3=0,y+1=0x=3,y=-1x^2-y^2=8
【证法1】(梅文鼎证明)作四个全等的直角三角形,设它们的两条直角边长分别为a、b,斜边长为c.把它们拼成一个多边形,使D、E、F在一条直线上.过C作AC的延长线交DF于点P.∵D、E、F在一条直线上,
是2x吧x的平方-2x+y的平方-6y+10=0,x²-2x+1+y²-6y+9=0(x-1)²+(y-3)²=0x-1=0,y-3=0x=1,y=3再问:应该
=(x+y)(x+y)(x^2-xy+y^2)(x^2-xy+y^2)=(x^3+y^3)^2
[(3x-3y)/(y平方-x平方)+(x平方-2xy+y平方)/(x平方-y平方)-(x平方-x+6)/(x+2)]/(x+y)=【-3/(x+y)+(x-y)/(x+y)-(x-3)]】/(x+y
(1)(x²-y²)/(x²-2xy+y²)=(x-y)(x+y)/(x-y)²=(x+y)/(x-y)x²+y²-2x-6y+1