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