1.计算(a-b)的四次方/(b-a)²=______.2.( )/7a²b的三次方=-7a的三次方b的三次方+2a的三次方+1
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![1.计算(a-b)的四次方/(b-a)²=______.2.( )/7a²b的三次方=-7a的三次方b的三次方+2a的三次方+1](/uploads/image/z/2001765-21-5.jpg?t=1.%E8%AE%A1%E7%AE%97%EF%BC%88a-b%29%E7%9A%84%E5%9B%9B%E6%AC%A1%E6%96%B9%2F%EF%BC%88b-a%29%26%23178%3B%3D______.2.%EF%BC%88+%EF%BC%89%2F7a%26%23178%3Bb%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%3D-7a%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9b%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B2a%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9%2B1)
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