若(2a-b)零次方=1,则分式a²-3ab+2b²分之a²+2ab-b²

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若(2a-b)零次方=1,则分式a²-3ab+2b²分之a²+2ab-b²
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若(2a-b)零次方=1,则分式a²-3ab+2b²分之a²+2ab-b²
若(2a-b)零次方=1,则分式a²-3ab+2b²分之a²+2ab-b²

若(2a-b)零次方=1,则分式a²-3ab+2b²分之a²+2ab-b²
(2a-b)零次方≠1 (本题改一下,否则不好做)
所以
2a=b
a²-3ab+2b²分之a²+2ab-b²
=(a²+2ab-b²)/(a²-3ab+2b²)
=(a²+4a²-4a²)/(a²-6a²+8a²)
=a²/3a²
=1/3