若a/b=2,求(a²+ab-b²)/(a²-2ab+2b²)的值
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若a/b=2,求(a²+ab-b²)/(a²-2ab+2b²)的值
若a/b=2,求(a²+ab-b²)/(a²-2ab+2b²)的值
若a/b=2,求(a²+ab-b²)/(a²-2ab+2b²)的值
a/b=2
将a=2b代入
(a²+ab-b²)/(a²-2ab+2b²)
=(4b²+2b²-b²)/(4b²-4b²+2b²)
=5/2
可以直接a=2b代入原式=(4b^2+2b^2-b^2)/(4b^2-4b^2+2b^2)=5/2