Help me finish them
1.18y二次方-19y-12
2.8u二次方+14u-147
3.a二次方-27ab-160b二次方
4.(4a-b)二次方+(9a+2b)(a+4b)
5.x四次方-10x二次方+9
math...
2007-08-07 3:46 pm
回答 (1)
2007-08-07 4:29 pm
✔ 最佳答案
1. 18y^2 - 19y - 12=(9y + 4)(2y - 3)
2. 8u^2 + 14u - 147
=(4u + 21)(2u - 7)
3. a^2 - 27ab - 160b^2
=(a - 32b)(a + 5b)
4.(4a - b)^2 + (9a + 2b)(a + 4b)
=16a^2 - 8ab + b^2 + 9a^2 + 38ab + 8b^2
= 25a^2 + 30ab + 9b^2
=(5a + 3b)^2
5. x^4 - 10x^2 + 9
=(x^2 - 1)(x^2 - 9)
=(x + 1)(x - 1)(x + 3)(x - 3)
收錄日期: 2021-04-13 00:58:32
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https://hk.answers.yahoo.com/question/index?qid=20070807000051KK00717