分解因式: (1)3a2﹣3b2 (2)2x2﹣12x+18.
- 教育综合
- 2024-04-06 07:57:25
分解因式:2x2-12x+18=______
2x2-12x+18,
=2(x2-6x+9),
=2(x-3)2.
故答案为:2(x-3)2.
14.分解因式:(1)2x^2-12x+18; (2)(x+y)^2-4(x+y-1); (3)(a^2+b^2)^2-4ab(a^2+b^2)+4a^2b^2
(1)2x^2-12x+18; =2(x²-6x+9) =2(x-3)² (2)(x+y)^2-4(x+y-1); =(x+y)²-4(x+y)+4 =(x+y-2)² (3)(a^2+b^2)^2-4ab(a^2+b^2)+4a^2b^2 =(a²+b²-2ab)² =(a-b)^4;分解因式:2x的2次方-12x+18
2x的2次方-12x+18 =2(x的2次方-6x+9) =2(x-3)的平方分解因式:(1)3x(a﹣b)﹣2y(b﹣a)(2)﹣2a 3 +12a 2 ﹣18a(3)4+12(x﹣y)+9(x﹣y) 2 (4)4a
(1)(a﹣b)(3x+2y)(2)﹣2a(a﹣3) 2 (3)(3x﹣3y+2)(3x﹣3y+2) (4)(2a+3b﹣3)(2a﹣3b+3) |
试题分析:(1)提公因式(a﹣b)即可; (2)先提﹣2a,再配方即可; (3)把3(x﹣y)看成一个整体,用配方法即可求解; (4)把2a,3b﹣3看成一个整体,运用平方差公式即可; 解:(1)3x(a﹣b)﹣2y(b﹣a) =(a﹣b)(3x+2y); (2)﹣2a 3 +12a 2 ﹣18a =﹣2a(a 2 ﹣6a+9) =﹣2a(a﹣3) 2 (3)4+12(x﹣y)+9(x﹣y) 2 =[3(x﹣y)+2]?[3(x﹣y)+2] =(3x﹣3y+2)(3x﹣3y+2); (4)4a 2 ﹣9(b﹣1) 2 =(2a) 2 ﹣(3b﹣3) 2 =(2a+3b﹣3)(2a﹣3b+3); 点评:本题考查了用提公因式法和公式法进行因式分解,一个多项式有公因式首先提取公因式,然后再用其他方法进行因式分解,同时因式分解要彻底,直到不能分解为止. |
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