Factorize x既3次-x既2次+x-1 寫埋條式出黎睇下,thanks
A. (x既2次+1)(x-1)
B. (x既2次-1)(x+1)
C. (x既2次+1)(1-x)
D. (1-x既2次)(x+1)
A farmer has a number of chickens and rabbits.If there are total of 40 haeads and 96 legs,find the number of chickens.
寫埋點知道答案,thanks
A. 8
B.16
C.24
D.32
中二既數學題目
2008-06-12 6:54 am
回答 (2)
2008-06-26 5:41 am
✔ 最佳答案
x^2 = x ge 2 次...如此類推x^3 - x^2 + x -1
=x^2(x-1)+(x-1)
= ( x^2 +1) (x-1)
第1題答案係 A
Let x be the no. of chickens and y be the no. of rabbbits
x+y=40 .........(1)
2x+4y=96.....(2)
From(1),
x+y=40
x=40-y .....(3)
Sub (3) into (2),
2 ( 40-y) +4y=96
80-2y+4y =96
2y=16
y=8 .......(4)
Sub(4) into (3)
x= 40-8
=32
So, the no. of chicken is 32
第2題的答案為D
有咩唔明SD E-MAIL問啦..^^
參考: 自己
2008-06-20 11:20 pm
A. 8
B.16
C.24
D.32
我計米知囉
B.16
C.24
D.32
我計米知囉
收錄日期: 2021-04-13 15:41:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080611000051KK02822