求与圆x的平方+y的平方-2x=0外切
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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
∵(x-2)的平方与(y+1)的平方互为相反数∴x-2=0,即x=2y+1=0,即:y=-1观察代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+中,每一项可知后一项与前一项之差为y,又
解题思路:转化已知条件求出2x+2y的值,根据同底数幂的乘法、同底数幂的乘方运算法则计算可解。解题过程:
x²-y²=(x+y)(x-y)所以最简公分母(x+y)²(x-y)所以2xy/(x+y)²=2xy(x-y)/(x+y)²(x-y)x/(x&sup
2xy/(x+y)的平方=2xy(x-y)/(x+y)²(x-y)x/x的平方-y的平方=x(x+y)/(x+y)²(x-y)
|x-y+3|+2(x+2y)^2=0x-y+3=0x+2y=0y=1,x=-2x^2+2xy+y^2=(x+y)^2=1
(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
平方差原式=(x²-4y²)(x²-4y²)=(x²-4y²)²=x^4-8x²y²+16y^4再问:麻烦你能
两式子相加相减得(X+Y)的平方=16X方-Y方=12题一解为4题二解为4
X^2+Y^2+X-2Y-20=0(X+1\2)^2+(Y-1)^2=20+1\4+1(X+1\2)^2+(Y-1)^2=49\4所以该圆的半径是7\2,圆心的坐标是(-1\2,1)X^2+Y^2=2
∵x-y+3的绝对值与2(x+y)的平方互为相反数即│x-y+3│=-4(x+y)²==>│x-y+3│+4(x+y)²=0∴x+y=0,x-y+3=0故x的平方+2xy+y的平方
将圆C的方程进行变形,为:(x-1/2)^2+(y+1)^2=5/4可知圆心O(1/2,-1),半径的平方为5/4.然后求圆心O(1/2,-1)关于直线L:x-y+1=0对称的点O'的坐标L的斜率为1
x平方+xy-2y的平方=0,(x-y)(x+2y)=0x-y=0或x+2y=0x=y或x=-2yx/y-y/x-x的平方+y的平方/xy=(x²-y²-x²-y
(x²+xy)/(x+y)²=x(x+y)/(x+y)²=x/(x+y)2xy/(x+y)²x/(x²-y²)∵最简公分母为:(x+y)
4a(x-y)的平方-2b(y-x)的平方+(y-x)=4a(x-y)的平方-2b(x-y)的平方-(x-y)=(x-y)[4a(x-y)-2b(x-y)-1]=(x-y)(4ax-4ay-2bx+2
由题意可知两圆圆心分别为A(1,-1),B(-2,0)则直线AB的斜率k=(-1-0)/(1-(-2))=-1/3且A,B的中点坐标(-1/2,-1/2)所以直线L的斜率为3,且过点(-1/2,-1/
x平方乘y平方=x^2(x^2-2x)=x^4-2x^3求导4x^3-6x^2所以极值点是3/2和0f(3/2)=-27/16f(0)=0在无穷大点f趋于正无穷所以取值范围是[-27/16,正无穷)
x-y+1=0x^2+8x+16=0x=-4y=-3x的平方+2xy+y的平方=(x+y)^2=(-4-3)^2=49
ax^2+3x^2+4x-1-2(x^2-y+2x)=ax^2+3x^2+4x-1-2x^2+2y-4x=(a+1)x^2+2y-1a+1=0a=-1a^2=1
x的平方+y的平方-2x+4y=-5x²-2x+1+y²+4y+4=0﹙x-1﹚²+﹙y+2﹚²=0x-1=0,y+2=0x=1,y=-2