a. x^2 + 4x +3
b. x^2 + 6x +8
c. x^2 - 5x - 24
d.x^2 + 2x - 15
e. x^2 - 7x +12
f.x^2 - 14x +48
g. 3x^2 - 10x -8
h. 6x^2 + 19x -20
因式分解 十字相乘法
2012-09-10 3:01 am
回答 (1)
2012-09-10 3:12 am
✔ 最佳答案
a. x^2 + 4x + 3 = (x + 3)(x + 1)b. x^2 + 6x + 8 = (x + 4)(x + 2)
c. x^2 - 5x - 24 = (x - 8)(x + 3)
d. x^2 + 2x - 15 = (x - 3)(x + 5)
e. x^2 - 7x + 12 = (x - 4)(x - 3)
f. x^2 - 14x + 48 = (x - 8)(x - 6)
g. 3x^2 - 10x - 8 = (x - 4)(3x + 2)
h. 6x^2 + 19x - 20 = (6x - 5)(x + 4)
參考: me
收錄日期: 2021-04-20 18:57:19
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https://hk.answers.yahoo.com/question/index?qid=20120909000051KK00645