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一、填空题（每空2分，共10分）：1．用分组分解法分解国式，分组的原则是：分组后可以_____，或者分组后可以_____2．若关于x的二次三项式ax2＋bx＋c分解因式时对应的十字相乘如下：二、运用十字相乘法分解因式（每小题5分，共30分）：三、用分组分解法分解因式（每小题7分，
First, fill in the blank (2 points per empty, a total of 10 points): 1. Grouping is used to decompose the country style. The principle of grouping is: after grouping, it can be _____, or it can be _____2 after grouping. If the quadratic trigonometric formula for ax2+bx+c is related to x, then the corresponding cross multiplication is as follows: Second, use cross-multiplication to factorize the equation (5 points for each question, 30 points in total): 3. Decompose by the group decomposition method Factor (7 points for each question,