作业帮初二数学竞赛计算题,在线等!1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]4. [-ac/(a-b)
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![初二数学竞赛计算题,在线等!1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]4. [-ac/(a-b)](/uploads/image/z/11548697-41-7.jpg?t=%E5%88%9D%E4%BA%8C%E6%95%B0%E5%AD%A6%E7%AB%9E%E8%B5%9B%E8%AE%A1%E7%AE%97%E9%A2%98%2C%E5%9C%A8%E7%BA%BF%E7%AD%89%211.+1%2F%28a-b%29%2B1%2F%28a%2Bb%29-%5B%28a-b%29%2F%28a%5E2-ab%2Bb%5E2%29%5D-%5B%28a%2Bb%29%2F%28a%5E2-ab%2Bb%5E2%29+%5D2.+%28b-c%29%2F%28a%5E2-ab-ac%2Bbc%29%2B%28c-a%29%2F%28b%5E2-bc-ab%2Bac%29%2B%28a-b%29%2F%28c%5E2-ac-bc%2Bab%293.+%28a-b%29%2F%28a%2Bb%29%2B%28b-c%29%2F%28b%2Bc%29%2B%28c-a%29%2F%2B%28c%2Ba%29%2B%5B%28a-b%29%28b-c%29%28c-a%29%2F%28a%2Bb%29%28b%2Bc%29%28c%2Ba%29%5D4.+%5B-ac%2F%28a-b%29)
初二数学竞赛计算题,在线等!1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]4. [-ac/(a-b)
初二数学竞赛计算题,在线等!
1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]
2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)
3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]
4. [-ac/(a-b)(b-c)]+[-ba/(b-c)(c-a)]+[-cb/(c-a)(a-b)]
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初二数学竞赛计算题,在线等!1. 1/(a-b)+1/(a+b)-[(a-b)/(a^2-ab+b^2)]-[(a+b)/(a^2-ab+b^2) ]2. (b-c)/(a^2-ab-ac+bc)+(c-a)/(b^2-bc-ab+ac)+(a-b)/(c^2-ac-bc+ab)3. (a-b)/(a+b)+(b-c)/(b+c)+(c-a)/+(c+a)+[(a-b)(b-c)(c-a)/(a+b)(b+c)(c+a)]4. [-ac/(a-b)
第一题中第三项的分母中的ab的符号应该是正号,然后第一项和第三项合并,第二项和第四项合并.变成立方差和立方和公式就可以了.
第二题的第一项分母变成(a-b)(a-c),第二项变成(b-a)(b-c),第三项变成（c-b）（c-a）最后三项通分.
第三题有错误,