化简求值b/(a-b)-b³/(a³-2a²b+ab²)÷(ab+b²)/(a²-b²),其中a=-2,b=3

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化简求值b/(a-b)-b³/(a³-2a²b+ab²)÷(ab+b²)/(a²-b²),其中a=-2,b=3
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