已知X/Y=2/3,则X^2-Y^2/X^2-2XY+Y^2除以XY+Y^2/X^2-XY

来源：学生作业帮助网编辑：六六作业网时间：2024/12/19 02:37:42

已知X/Y=2/3,则X^2-Y^2/X^2-2XY+Y^2除以XY+Y^2/X^2-XY已知X/Y=2/3,则X^2-Y^2/X^2-2XY+Y^2除以XY+Y^2/X^2-XY已知X/Y=2/3,

已知X/Y=2/3,则X^2-Y^2/X^2-2XY+Y^2除以XY+Y^2/X^2-XY
已知X/Y=2/3,则X^2-Y^2/X^2-2XY+Y^2除以XY+Y^2/X^2-XY

已知X/Y=2/3,则X^2-Y^2/X^2-2XY+Y^2除以XY+Y^2/X^2-XY
原式=(X+Y)(X-Y)/(X-Y)^2÷Y(X+Y)/(X+Y)(X-Y)
=(X+Y)/(X-Y)÷Y(X-Y)
=(X+Y)/(X-Y)×(X-Y)/Y
=(X+Y)/Y
=X/Y+Y/Y
=2/3+1
=5/3

根号下大于等于0
1/x≥0
x>0
真数大于0
x>0
分母不等于0
1-lgx≠0
lgx≠1
x≠10
所以定义域(0,10)∪(10,+∞)

是不是没有加括号啊；如果是（X^2-Y^2）/（X^2-2XY+Y^2）除以（XY+Y^2）/（X^2-XY）的话，分子分母分别进行化简就得到X/Y,很显然等于2/3啊

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知2x=3y,则y分之x=< >,y分之x+y=< >. 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 比例线段：已知x/y=2/3,则 x/x+y= ,x-y/x+y= 要过程! 已知|x+y-3|+(x-y)2=0则已知f(x+y,y/x)=x^2-y^2,则f(x,y)= 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知方程组{(X+Y)-3(X-Y)=7,2(X+Y)+(X-Y）=-7}则(X+Y)(X-Y)= 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知F(X+Y,X-Y)=X^2*Y+X*Y^2,则F(X,Y)=? 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知3x-4y=0,则x^2-y^2/x^2+y^2 已知x^2-3xy+2y^2=0 则x/y+x/y= 已知x-2y=3,则(2x+y-6)/(3x-y-9)=? 已知2x-3y=0则3x-y比x+2y= 已知x/y=2/3,则2x-y/x+2y的值是多少? 已知(3x+y+6)²+|x+y+2|=2,则x=,y=.