圆(X-3)平方 (Y-4)平方=1关于直线X 2Y-3=0对称的圆的方程是
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原式=(x²+y²+2xy)(x²+y²-2xy)/(x+y)²=(x+y)²(x-y)²/(x+y)²=(x-y)
(x²-4y²)/(x²+4x+4)×(x+2)/(3x²+6xy)=[(x+2y)(x-2y)]/(x+2)²×(x+2)/[3x(x+2)]=(x
4x^2-3y^2=73x^2+2y^2=19相加7x^2-y^2=26所以14x^2-2y^2=2(7x^2-y^2)=2*26=52
1)—(x+y)四次方2)(3x+y)(3x-y+2)3)(x-3)(7x+y)4)(1+x-2y)(1-x+2y)5)5(y-x)平方(1-2y+x)6)6(a-b)平方(a-2b)7)(x+y-2
(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
4/x-15x²y再问:朋友,发一下过程再答:3x²y-(-3x)²×(2y)+x³y²/(x²x²y²/4)=3x
(z²-x²-y²)-4x²y²=(z²-x²-y²-2xy)(z²-x²-y²+2xy)
原式=9x⁴/16y²*2y/3x+x²/2y²*x/2y²=3x³/8y+x³/4y⁴=(3x³y
x平方(3x+5y)平方-y平方(5x+3y)平方=x²(3x+5y)²-y²(5x+3y)²=[x(3x+5y)]²-[y(5x+3y)]²
因为x²+y²-4x+2y+5=0所以(x²-4x+4)+(y²+2y+1)=0所以(x-2)²+(y+1)²=o所以x=2y=-1所以下面
一式子减去二式子乘以2的差得x²-2xy-3y²=0(x+y)(x-3y)=0x=-y或x=3y当x=-y时代入一式3y²-y²=8y=±2当x=3y时代入一式
(4x-3y)²-16y²=(4x-3y+4y)(4x-3y-4y)=(4x+y)(4x-7y)x²+2x(y-z)+(z-y)²=x²+2x(y-z
5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)]=5xy平方-2x平方y+[3xy平方-4xy+2x平方y+2x平方y)]=5xy平方-2x平方y+3xy平方-4xy+2x平
=(x-3y+2x)(x-3y-2x)=(3x-3y)(-x-3y)=-3(x-y)(x+3y)再问:这是用的什么方法因式分解的再答:平方差公式
(x^2+y^2)^2-4x^2y^2=[(x^2+y^2)+2xy][(x^2+y^2)-2xy]=(x^2+2xy+y^2)(x^2-2xy+y^2)=(x+y)^2(x-y)^2
(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
x²-y²+5x+3y+4=(x²+4x+4)-(y²-4y+4)+x-y+4=(x+2)²-(y-2)²+x-y+4=(x+y)(x-y+
=(x²+y²)²-(2xy)²=(x²+2xy+y²)(x²-2xy+y²)=(x+y)²(x-y)
根据:a²-b²=(a+b)(a-b)(x²+y²)²-(2xy)²假设:(x²+y²)²=a²,(