分式加法:(1/x-y) +(1/x^2+y^2)-(1/x+y)- (4x^2y/x^4+y^4)
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1/x-y) +(2y/x^2+y^2)-(1/x+y)- (4x^2y/x^4+y^4)
=1/(x-y)-1/(x+y)+2y/(x²+y²)-4x²y/(x^4+y^4)
=(x+y-x+y)/ (x²-y²)+2y/(x²+y²)-4x²y/(x^4+y^4)
=2y/(x²-y²)+1/(x²+y²) -4x²y/(x^4+y^4)
=(2x²y+2y³+2x²y-2y³) /(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y/(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y(x^4+y^4-x^4+y^4)/(x^8-y^8)
=8x²y^5/(x^8-y^8) 不懂就问
=1/(x-y)-1/(x+y)+2y/(x²+y²)-4x²y/(x^4+y^4)
=(x+y-x+y)/ (x²-y²)+2y/(x²+y²)-4x²y/(x^4+y^4)
=2y/(x²-y²)+1/(x²+y²) -4x²y/(x^4+y^4)
=(2x²y+2y³+2x²y-2y³) /(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y/(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y(x^4+y^4-x^4+y^4)/(x^8-y^8)
=8x²y^5/(x^8-y^8) 不懂就问
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(1/x-y) +(2y/x^2+y^2)-(1/x+y)- (4x^2y/x^4+y^4)
=1/(x-y)-1/(x+y)+2y/(x²+y²)-4x²y/(x^4+y^4)
=(x+y-x+y)/ (x²-y²)+2y/(x²+y²)-4x²y/(x^4+y^4)
=2y/(x²-y²)+1/(x²+y²) -4x²y/(x^4+y^4)
=(2x²y+2y³+2x²y-2y³) /(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y/(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y(x^4+y^4-x^4+y^4)/(x^8-y^8)
=8x²y^5/(x^8-y^8)
=1/(x-y)-1/(x+y)+2y/(x²+y²)-4x²y/(x^4+y^4)
=(x+y-x+y)/ (x²-y²)+2y/(x²+y²)-4x²y/(x^4+y^4)
=2y/(x²-y²)+1/(x²+y²) -4x²y/(x^4+y^4)
=(2x²y+2y³+2x²y-2y³) /(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y/(x^4-y^4)- 4x²y/(x^4+y^4)
=4x²y(x^4+y^4-x^4+y^4)/(x^8-y^8)
=8x²y^5/(x^8-y^8)
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