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x的五次方y-9xy的五次方加一個y =xy(x的4次方-9y的4次方) =xy(x平方+3y平方)(x平方-3y平方)有理數範圍 =xy(x平方+3y平方)(x+√3y)(x-√3y)實數範圍 =xy(x+√3yi)(x-√3yi)(x+√3y)(x-√3y)複數範圍
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