作业帮在下列各题括号内,添上使等式成立的分子或分母 急啊,在线等2x^2+2xy/x+y=2x/( )x-3/(1-x)^2(2-x)=( )/(x-1)^2(x-2)-2x/1-2x=( )/2x^2-xx-y/5y=(y-x)^2/( )3x^2-xy/9x^2-6xy+y^2=x/( )=( )/9x^2-y^21-x=-( )/x+1a^3-3ab+b
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在下列各题括号内,添上使等式成立的分子或分母 急啊,在线等2x^2+2xy/x+y=2x/( )x-3/(1-x)^2(2-x)=( )/(x-1)^2(x-2)-2x/1-2x=( )/2x^2-xx-y/5y=(y-x)^2/( )3x^2-xy/9x^2-6xy+y^2=x/( )=( )/9x^2-y^21-x=-( )/x+1a^3-3ab+b
在下列各题括号内,添上使等式成立的分子或分母 急啊,在线等
2x^2+2xy/x+y=2x/( )
x-3/(1-x)^2(2-x)=( )/(x-1)^2(x-2)
-2x/1-2x=( )/2x^2-x
x-y/5y=(y-x)^2/( )
3x^2-xy/9x^2-6xy+y^2=x/( )=( )/9x^2-y^2
1-x=-( )/x+1
a^3-3ab+b^2/ab=[( )/ab]-3
快啊
在下列各题括号内,添上使等式成立的分子或分母 急啊,在线等2x^2+2xy/x+y=2x/( )x-3/(1-x)^2(2-x)=( )/(x-1)^2(x-2)-2x/1-2x=( )/2x^2-xx-y/5y=(y-x)^2/( )3x^2-xy/9x^2-6xy+y^2=x/( )=( )/9x^2-y^21-x=-( )/x+1a^3-3ab+b
在下列各题括号内,添上使等式成立的分子或分母
2x^2+2xy/x+y=2x/( 1 )=2x
x-3/(1-x)^2(2-x)=( 3-x )/(x-1)^2(x-2)
-2x/1-2x=( 2x^2 )/2x^2-x
x-y/5y=(y-x)^2/( -5y(y-x) )
3x^2-xy/9x^2-6xy+y^2=x/(3x-y )=(x(3x+y) )/9x^2-y^2
1-x=-( x^2-1 )/x+1
a^3-3ab+b^2/ab=[(a^3+b^2 )/ab]-3