代数式求值(几^几代表几的几次方)1.若a.b.c都是有理数,且a+b+c=0,a^3+b^3+c^3=0,求代数式a^5+b^5+c^5=?2.a/(a^2+a+1)=1/6,求代数式a^2/(a^4+a^2+1)的值.3.a.b.c.d为互不相等的整数,abcd=25,求a+b+c+d.4.x/(a-b)=y/(b-c)=z/(c-a

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