若x/2=y/3,则分式(7x方-y方)/(x方-2xy+3y方)的值是多少?

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若x/2=y/3,则分式(7x方-y方)/(x方-2xy+3y方)的值是多少?若x/2=y/3,则分式(7x方-y方)/(x方-2xy+3y方)的值是多少?若x/2=y/3,则分式(7x方-y方)/(

若x/2=y/3,则分式(7x方-y方)/(x方-2xy+3y方)的值是多少?
若x/2=y/3,则分式(7x方-y方)/(x方-2xy+3y方)的值是多少?

若x/2=y/3,则分式(7x方-y方)/(x方-2xy+3y方)的值是多少?
x=2k
y=3k
(7x方-y方)/(x方-2xy+3y方)
=(28k方-9k方)/(4k方-12k方+27k方)
=19k方/19k方
=1

等于1 ,把y=1.5x带入式子

19/23
x=2/3y
带入式中计算就可以了