若x的平方 y的平方-2by b的平方=0与x轴相切,求实数b的值.
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(1)x的平方-y的平方+4x+4y=(x+y)(x-y)+4(x+y)=(x+y)(x-y+4)(2)x的平方*y的平方+1-x的平方-y的平方=x²y²-x²+1-y
(x的平方+2xy+y的平方)(x的平方-xy+y的平方)的平方=(x²+2xy+y²)(x²-xy+y²)²=(x+y)²(x²
约分6x的平方y/2y的平方=3x^2/y
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
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
Y^2(2X+1)(X-3)
2x(-xy)^2-x^2(x^2y^2-y^2)=(xy)^2(2x-x^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
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
((x-y)(x-y))/((x-y)(x+y))=(x-y)/(x+y).
x^2-2x+y^2-4y+5=0,所以:(x-1)^2+(y-2)^2=0所以:x-1=0,y-2=0,解得:x=1,y=2所以:9x^2y^2-12x^3y^2+4x^4y^2=9y^2-12y^
|Y-2|+(X-1)平方=0而|Y-2|>=0;(X-1)平方>=0所以只能等于0,即y=2,x=1x立方-x平方y+xy平方+x平方y-xy平方-y立方=1-2+4+2-4-8=-7
x的平方乘y的平方-4-2x的平方乘y的平方=-x的平方乘y的平方-4
(x^2+y^2)^2-4x^2y^2=(x^2+y^2+2xy)(x^2+y^2-2xy)=(x+y)^2*(x-y)^2=(x^2-y^2)^2数学佰亊嗵为你解答,希望我的回答为您带来帮助!
得1将x^2+y^2看为一个整体,变为一个二次方程,解得1和-4,-4舍去.再问:������������£���������ô���ġ�再答:���[http://pinyin.cn/1tSiLPG
∵4x²-y²+2x-y=(2x-y)(2x+y)+(2x-y)=(2x-y)(2x+y+1)∴4x²-y²+2x-y=(2x-y)(2x+y+1)不懂得欢迎追
由题意可得:(2xy-y²)/(x²-y²)+(x-y)/(x+y)=[(2xy-y²)+(x-y)²]/(x²-y²)=x
a(x²+2xy+y²)-b(x²-y²)=a(x+y)²-b(x+y)(x-y)=(x+y)(ax+ay-bx+by)再问:你确定对吗?和我已开始算
x的平方-x-4y的平方+2y=(x-2y)(x+2y)-(x-2y)=(x-2y)(x+2y-1)
(x平方+2xy+y的平方)/(x+y)=(x+y)²/(x+y)=x+y