非零复数a,b满足a^2+ab+b^2=0则(a/a+b)^2000+(b/a+b)^2000=
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![非零复数a,b满足a^2+ab+b^2=0则(a/a+b)^2000+(b/a+b)^2000=](/uploads/image/z/15091789-13-9.jpg?t=%E9%9D%9E%E9%9B%B6%E5%A4%8D%E6%95%B0a%2Cb%E6%BB%A1%E8%B6%B3a%5E2%2Bab%2Bb%5E2%3D0%E5%88%99%28a%2Fa%2Bb%29%5E2000%2B%28b%2Fa%2Bb%29%5E2000%3D)
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非零复数a,b满足a^2+ab+b^2=0则(a/a+b)^2000+(b/a+b)^2000=
非零复数a,b满足a^2+ab+b^2=0则(a/a+b)^2000+(b/a+b)^2000=
非零复数a,b满足a^2+ab+b^2=0则(a/a+b)^2000+(b/a+b)^2000=
令t=a/b
则有t^2+t+1=0,两边同时乘以t-1
即t^3=1,
注意到t+1=-t^2
故a/(a+b)=t/(1+t)=-1/t;b/(a+b)=1/(1+t)=-1/t^2
故原式=1/t^2000+1/t^4000
=t* t^(-2001) + t^2 * t^(-4002)
=t+t^2=-1