b＝1 ∴a+b＝1/2 选A
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帮你找找这本书如何
解：令x = asinθ，dx = acosθdθ
原式= ∫(0→π/2) (acosθ)/(asinθ + acosθ) dθ
= (1/2)∫(0→π...
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