若x=5y,且x≠0,则x²-y²/x²=

若x=5y,且x≠0,则x²-y²/x²=
若x=5y,且x≠0,则x²-y²/x²=

若x=5y,且x≠0,则x²-y²/x²=
x²-y²/x²=[(5y)^2-y^2]/(5y)^2
=24y²/25y²
=24/25

(x²-y²)/x²=1-(y/x)²=1-(1/5)²=24/25

如果是x²-y²/x²，凭x=5y做不出来

=24/25