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一、填空题（每小题３分，共３０分）（１）因式分解的一般步骤是：首先观察能不能，然后考虑应用或法，项数为三项以上时，应当考虑．（２）多项式－５ａｂ＋１５ａ２ｂｘ－３５ａｂ３ｙ的公因式是．（３）１８ａ３＋１＝（１２ａ＋１）（ ）（４）ｘ２－（ ）＋１４＝?
First, fill in the blank questions (each small question 3 points, a total of 30 points) (1) factorial decomposition of the general steps are: first observe whether you can, and then consider the application or method, the number of items for more than three, it should be considered. (2) The common factor of polynomial-5ab + 15a2bx-35ab3y is. (3) 18a3 + 1 = (12a + 1) (4) x2- () + 14 =?