x*2+7x+12 點計呀,,唔該
請詳細列明,,,
x*2+7x+12(20 點)
2008-10-25 11:48 pm
回答 (2)
2008-10-26 5:11 am
✔ 最佳答案
x*2+7x+12= 2x+7x+12
= 9x+12
2008-10-26 2:04 am
x*2係唔係x既square?......x^2
expand factorize
x^2+ax+b=(x+p)(x+q)
p+q=a; pq=b
x^2+7x+12=(x+3)(x+4)
4+3=7;4*3=12
你將(x+3)(x+4)expand就會得出x^2+7x+12
expand factorize
x^2+ax+b=(x+p)(x+q)
p+q=a; pq=b
x^2+7x+12=(x+3)(x+4)
4+3=7;4*3=12
你將(x+3)(x+4)expand就會得出x^2+7x+12
參考: 自己
收錄日期: 2021-04-24 10:16:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081025000051KK01303