4/(a²-1)-2/(a²+a) 计算,
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![4/(a²-1)-2/(a²+a) 计算,](/uploads/image/z/12981104-8-4.jpg?t=4%2F%EF%BC%88a%26%23178%3B-1%EF%BC%89%EF%BC%8D2%2F%EF%BC%88a%26%23178%3B%2Ba%EF%BC%89+%E8%AE%A1%E7%AE%97%2C)
4/(a²-1)-2/(a²+a) 计算,
4/(a²-1)-2/(a²+a) 计算,
4/(a²-1)-2/(a²+a) 计算,
您好:
4/(a²-1)-2/(a²+a)
=4/(a+1)(a-1)-2/a(a+1)
=[4a-2(a-1)]/a(a+1)(a-1)
=(2a+2)/a(a+1)(a-1)
=2/a(a-1)
不明白,可以追问如有帮助,记得采纳
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