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若x=2010,y=2011,则(x+y)-(x^4-y^4分之x^2+y^2)
题目详情
若x=2010,y=2011,则(x+y)-(x^4-y^4分之x^2+y^2)
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答案和解析
(x+y)-(x^2+y^2)/(x^4-y^4)
=(x+y)-(x^2+y^2)/(x^2+y^2)(x^2-y^2)
=(x+y)-1/(x^2-y^2)
=(x+y)-1/(x+y)(x-y)
=4021-1/4021
=4020又4020/4021
=(x+y)-(x^2+y^2)/(x^2+y^2)(x^2-y^2)
=(x+y)-1/(x^2-y^2)
=(x+y)-1/(x+y)(x-y)
=4021-1/4021
=4020又4020/4021
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