分式的基本性质 (9 9:24:45)已知3a-b/2b-a=7,x+y/2x-y=5,求ax-2by/ax+2by.
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分式的基本性质 (9 9:24:45)已知3a-b/2b-a=7,x+y/2x-y=5,求ax-2by/ax+2by.
分式的基本性质 (9 9:24:45)
已知3a-b/2b-a=7,x+y/2x-y=5,求ax-2by/ax+2by.
分式的基本性质 (9 9:24:45)已知3a-b/2b-a=7,x+y/2x-y=5,求ax-2by/ax+2by.
3a-b/2b-a=7得到a/b=3/2
x+y/2x-y=5得到x/y=6/11
两式相乘得到ax/by=9/11
ax-2by/ax+2by
=1-4by/(ax+2by)
=1-1/(ax/4by+1/2)
=1-1/(9/44+1/2)
=13/44
请问题目对吗?
-1/3