y=2分之1x的平方-4x 3-搜答案-智慧作业帮

[（x的平方+y的平方）-（x-y)的平方+2y(x-y)]/4y=1(x²+y²-x²+2xy-y²+2xy-2y²)/4y=1(4xy-2y

x³y+2x²y²+xy³=xy（x²+2xy+y²）=xy（x+y）²=-1*2²=-4

原式=y(x+2y)(x-2y)/(x+2y)²×(4xy+x²-2xy)/(x-2y)=y(x+2y)(x-2y)/(x+2y)²×x(x+2y)/(x-2y)=xy当

因为x=1+根号2y=1减根号2所以xy=1+根号2乘以1减根号2=1-2=-1x+y=2所以可以求得,原式=xy/(x+y)=-1/2

1-（x-y）/(x+2y)÷(x²-y²)/(x+2y)²=1-(x-y)/(x+2y)×(x+2y)²/(x+y)(x-y)=1-(x+2y)/(x+y)=

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

3x^2+xy-2y^2=(3x-2y)(x+y)=0x=-2y/3,或x=-y但由于你要求的式子中分母里有X平方-Y平方x=-y舍去其他就代入吧

您好：原式=2x/(2x+3y)(2x-3y)-1/(2x+3y)=(2x-2x+3y)/(2x+3y)(2x-3y)=3y/(2x+3y)(2x-3y)如果本题有什么不明白可以追问,如果满意记得采纳

(x分之x的平方-y的平方)乘以(x的平方-2xy+y的平方分之2x)其中x=2y=1=(x^2-y^2)/x*2x/(x-y)^2=(x+y)(x-y)/x*2x/(x-y)^2=2(x+y)/(x

因为｜x+1｜+(y-1/2)²=0所以x=-1y=1/2所以x²y+(xy)²+y³/4=25/32可以追问望采纳

（x³＋3x²y-9xy²）-1/2（6x²y＋4x²）=x³＋3x²y-9xy²-3x²y-2x²

已知:[(x²+y²)-(x-y)²+2y(x-y)]/4y=1,求4x²-(4x-2)/y²[(x²+y²)-(x-y)&sup

x/y=1/2y=2x(x^2+2xy+y^2)/(x^2-xy+y^2)=(x^2+2x*2x+(2x)^2)/(x^2-x*2x+(2x)^2)=9x^2/3x^2=3

y分之x=2分之1y=2x所以原原式=(x²-2x²-8x²)分之（x²＋4x²＋4x²）=-9分之9=-1

x的平方+2xy+y的平方分之x的平方-y的平方=(x+y)(x-y)/(x+y)²=(x-y)/(x+y)∵x+y=2,x-y=1∴原式=1/2

僾→SJ▁▁TVXQ： [(x＋1/2y)²＋(x－1/2y)²](2x²－1/2y²)＝(x&s

（Y-X)/4x(y-1)-y(x-1)=4推出Y-X=42分之x的平方加y的平方推出X的平方/4+Y的平方=4

y分之x=2分之1y=2x所以原原式=(x²-2x²-8x²)分之（x²＋4x²＋4x²）=-9分之9=-1

y=(x^3-2)/[2(x-1)^2]y'=1/2*[3x^2(x-1)^2-(x^3-2)*2(x-1)]/(x-1)^4=1/2*[3x^2(x-1)-2(x^3-2)]/(x-1)^3=1/2

x-y分之2x的平方-y-x分之x的平方-4xy+x-y分之2y的平方-x的平方=2x/(x-y)-(x²-4xy)/(y-x)+(2y-x²)/(x-y)=(2x+x²