y平方-6xdy dx 2y=0
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把25拆成16+9(x²-8x+16)+(y²+6y+9)=0(x-4)²+(y+3)²=0平方大于等于0,相加等于0若有一个大于0,则另一个小于0,不成立.所
x平方+y平方+8x+6y+25=0(x+4)²+(y+3)²=0∴x=-4;y=-3∴(x²-4y²)/(x²+4xy+4y²)-x/(x
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
3y(y-2)=0y=0,y=2
x^2+y^2-4x+6y+13=0x^2-4x+4+y^2+6y+9=0(x-2)^2+(y+3)^2=0x-2=0,y+3=0x=2,y=-3(x^2+y)/(x^2-y)=(4-3)/(4+3)
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+2)^2+(y-3)^2=0x=-2,且,y=3xy=-6
x^2+y^2-4x-6y+13=0(x^2-4x+4)+(x^2-6y+9)=0(x-2)^2+(y-3)^2=0所以(x-2)^2=0,(y-3)^2=0x-2=0,y-3=0x=2,y=3xy/
(x平方+y平方)平方-y平方=x平方+6所以(x²+y²)²-(x²+y²)-6=0(x²+y²+2)(x²+y
6x^2-5xy-6y^2=0即(2x-3y)(3x+2y)=0亦即2x-3y=0或3x+2y=0得x,y满足在这两条过(0,0)的直线即可.
x=-3y=4式子等于-49/12
x²-4x+y²+6y+13=0﹙x²-4x+4﹚+﹙y²+6y+9﹚=0﹙x-2﹚²+﹙y+3﹚³=0x-2=0,x=2y+3=0,y=﹣
x的平方-4x+y的平方-6y+13=x的平方-4x+4+y的平方-6y+9=(x-2)的平方+(y-3)的平方=0由于(x-2)的平方和(y-3)的平方都≥0,因此x-2=0,y-3=0,x=2,y
4x平方加y平方-4x+6y+10=(2x-1)^2+(y+3)^2=02x-1=0y+3=0x=1/2y=-3x^2+y^2=1/4+9=37/4
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
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^2+y^2+4x-6y+13=0(x^2+4x+4)+(y^2-6y+9)=0(x+2)^2+(y-3)^2=0因为(x+2)^2和(y-3)^2都是非负数,所以:(x+2)^2=0(y-3)^2
m²+n²=0则有m=0n=0运用这个道理x²+y²-6x+10y+34=0x²-6x+y²+10y+34=0x²-6x+9才能拼
是x²+9y²-4x+6y+5=0吧x²+9y²-4x+6y+5=0x²-4x+4+(9y²+6y+1)=0(x-2)²+(3y+