[-4分之1x的平方y的平方]除以[-4分之3xy]
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[(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
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)=
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+2y)(x-2y)/(x+y)²×2x(x+y)/(x-2y)=-2x(x+2y)/(x+y)=-(2x²+4xy)/(x+y)
(x³+3x²y-9xy²)-1/2(6x²y+4x²)=x³+3x²y-9xy²-3x²y-2x²
=x²/2(y的4次方-16)=x²/2(y²+4)(y²-4)=x²/2(y²+4)(y+2)(y-2)
已知5x-4y=0,切xy≠0,x/y=4/5;求(x平方-y平方)分之(x平方+y平方)-(x-y)分之(x+y)的值=(x²+y²)/(x²-y²)-(x+
已知:[(x²+y²)-(x-y)²+2y(x-y)]/4y=1,求4x²-(4x-2)/y²[(x²+y²)-(x-y)&sup
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
您好:0.4x的平方+5分之3y的平方-3分之1x的平方-0.16y的平方=(2/5-1/3)x的平方+(3/5-4/25)y的平方=1/15x的平方+11/25y的平方如果本题有什么不明白可以追问,
(x^2-4y^)\(x+y)^2乘以2x(x+y)/(x+2y)=2x(x-2y)\(x+y)
(8x^2/9y^2)*(3y/-4x)=-2x/3y不懂请追问,满意请采纳~再问:过程????再答:就相当于(8x的平方除以-4x)乘以(3y除以9y的平方)=-2x乘以3y分之一=负的3y分之2x
a²=m²+12b²=4-m²c²=a²+b²=16c=4所以焦距=2c=8
[1/(x-y)-1/(x+y)]/[xy^2/(x^2-y^2)]=[(x+y-x+y)/(x-y)(x+y)]/[xy^2/(x-y)(x+y)]=[2y/(x-y)(x+y)]/[xy^2/(x
(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
(1-y+x分之y)÷y的平方-x的平方分之x=[(y+x-y)/(y+x)]÷x/(y²-x²)=x/(y+x)*[(y+x)(y-x)/x]=y-x
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)
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-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