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九年级数学：怎么解方程(x+1)4+(x-1)4=16？换元法巧妙运用很简单
九年级数学：怎么解方程(x+1)4+(x-1)4=16？换元法巧妙运用很简单
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题62/168
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