1.已知x^2-4y^2=0,则分式(x^2-xy+y^2)/(x^2+xy+y^2)的值为_________.
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1.已知x^2-4y^2=0,则分式(x^2-xy+y^2)/(x^2+xy+y^2)的值为_________.
2.在下列括号里填上适当的代数式:
①(x^2-3xy-2y^2)/x^2 = 1-( );
②(x^2-xy+y^2)/xy = ( )-1;
③(1-a^2+2ab-b^2)/(a-b)= 1/(a-b) -( ).
3.(x^2-1)/(x^2+2x+1)÷(x+1)/(x-1)÷(1-x)/(1+x)=( ) .
2.在下列括号里填上适当的代数式:
①(x^2-3xy-2y^2)/x^2 = 1-( );
②(x^2-xy+y^2)/xy = ( )-1;
③(1-a^2+2ab-b^2)/(a-b)= 1/(a-b) -( ).
3.(x^2-1)/(x^2+2x+1)÷(x+1)/(x-1)÷(1-x)/(1+x)=( ) .
1.4/7 x^2-4y^2=0整理得出:x^2=4y^2 且 x=2y
2.①(3y-2y^2)/x^2
②(x^2+y^2)/xy
③ (a-b)
3.
1-x
-------
(x+1)^3
2.①(3y-2y^2)/x^2
②(x^2+y^2)/xy
③ (a-b)
3.
1-x
-------
(x+1)^3
1.已知x^2-4y^2=0,则分式(x^2-xy+y^2)/(x^2+xy+y^2)的值为_________.
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