若a/b=2,求分式a²+ab-b²/a²-2ab+2b²的值
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若a/b=2,求分式a²+ab-b²/a²-2ab+2b²的值
若a/b=2,求分式a²+ab-b²/a²-2ab+2b²的值
若a/b=2,求分式a²+ab-b²/a²-2ab+2b²的值
a/b=2
a=2b
a²+ab-b²/a²-2ab+2b²
=(4b²+2b²-b²)/(4b²-4b²+2b²)
=5/2
a/b=2
a=2b
a²+ab-b²/a²-2ab+2b²
=((2b)²+(2b)*b-b²)/((2b)²-2*(2b)*b+2b²)
=(4+2-1)/(4-4+2)
=5/2
=2.5
不知道
a/b=2
a=2b
a²+ab-b²/a²-2ab+2b²
=4b²+2b²-b²/4b²-4b²+2b²
=5b²/2b²
=5/2