填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )

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填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )

填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )
填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )
填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )

填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )
-5/7x=(-5 )/7x=5/( -7x )
x-y/x+y=X^2-y^2/(x+y)²

  1. -5   -7x

  2. (x+y)^2