中二既數學題目

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..^^

A. 8
B.16
C.24
D.32
我計米知囉