
a-b分之1-a+b分之1+a的2次方+b的2次方分之2b
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1/(a-b)-1/(a+b)+2b/(a²+b²)
=[(a+b)-(a-b)]/[(a-b)(a+b)]+2b/(a²+b²)
=2b/(a²-b²)+2b/(a²+b²)
=[2b(a²+b²)+2b(a²-b²)]/[(a²-b²)(a²+b²)]
=[2a²b+2b³+2a²b-2b³]/(a^4-b^4)
=4a²b/(a^4-b^4)
=[(a+b)-(a-b)]/[(a-b)(a+b)]+2b/(a²+b²)
=2b/(a²-b²)+2b/(a²+b²)
=[2b(a²+b²)+2b(a²-b²)]/[(a²-b²)(a²+b²)]
=[2a²b+2b³+2a²b-2b³]/(a^4-b^4)
=4a²b/(a^4-b^4)
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