2x的平方y-8xy 8y
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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
x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x
4X^2+4Y^2+4X+8Y+5=0,即:(2X+1)^2+(^2Y+2)^2=0∴2X+1=0;2Y+2=0X=-1/2;Y=-1.所求式子=(4XY-2Y^2)/(2Y)=2X-Y=-1+1=0
x平方+2xy-8y平方=0(x+4y)(x-2y)=0x=-4y或x=2y(1)当x=-4y(x-y)/(x+y)=(-5)/(-3)=5/3(2)当x=2y(x-y)/(x+y)=1/3
x平方+3y平方-2等于8x²+3y²-2=8两边同时乘以55x²+15y²-10=405x²+15y²=505x平方+15y平方+215x
2(y-x)²-7(x-y)+6(x-y)-3(y-x)²=-(y-x)²-(x-y)=-(x-y)²-(x-y)=-(x-y)[(x-y)+1]=(y-x)(
=8x²-16y²-7x²-xy+xy=x²-16y²
(x-y)^2-8(x-y-2)=(x-y)^2-8(x-y)+16=[(x-y)-4]^2=(x-y-4)^2
令x的平方+y的平方=m则m(m-2)=8m^2-2m-8=0(m-4)(m+2)=0m=4或m=-2(舍去)则x^2+y^2=4
x=-3y=4式子等于-49/12
原式=-2x²y^6+20x²y³再问:还在吗再答:嗯有新的题请采纳我,重新问再问:(x+3y)(2x-y)谢谢再答:采纳我,重新问
{(x的平方+y的平方)-(x的平方-y的平方)+2y(x-y)}除4y=(2y^2+2y(x-y)/(4y)=2xy/(4y)=x/2
【2(x-y)²-8(x-y)²(x+y)+6y(x-y)²】÷2(x-y)²=2(x-y)²÷2(x-y)²-8(x-y)²(x
x8+256y8-32x4y4(用手机打的不要介意,给个最佳答案吧)
∵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
x的平方-64y的平方分之2x-x-8y分之1=[2x-(x+8y)]/(x-8y)(x+8y)=(x-8y)/(x-8y)(x+8y)=1/(x+8y)
x的平方-x-4y的平方+2y=(x-2y)(x+2y)-(x-2y)=(x-2y)(x+2y-1)
【(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=(x-y)²[x-y-8(x+y)+6y]/2(x-y)²=1/2(x-y-8x-
(x平方+2xy+y的平方)/(x+y)=(x+y)²/(x+y)=x+y