25a的4次幂-a2 5(2a-1)²-2a+1
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![25a的4次幂-a2 5(2a-1)²-2a+1](/uploads/image/z/267723-27-3.jpg?t=25a%E7%9A%844%E6%AC%A1%E5%B9%82-a2+5%EF%BC%882a-1%29%26%23178%3B-2a%2B1)
25a的4次幂-a2 5(2a-1)²-2a+1
25a的4次幂-a2 5(2a-1)²-2a+1
25a的4次幂-a2 5(2a-1)²-2a+1
25a的4次方-a²
=a²(25a²-1)
=a²(5a+1)(5a-1)
(2a-1)²-2a+1
=(2a-1)²-(2a-1)
=[(2a-1)-1](2a-1)
=(2a-2)(2a-1)
=2(a-1)(2a-1)
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