本帖最后由 niielle 于 2012-11-2 08:30 PM 编辑
回复 niielle
第十一题对了~想问下去哪里找100度?
tenkeason 发表于 2012-11-2 08:13 PM 
1min=2°嘛
最大是50min,最小是20min
50minx2=100°
20x2=40°
相减~~~
第八

2t(m-1)=t-1
2tm-2t=t-1
2tm-1=t+2t
2tm-1=3t
2tm-3t=1
t(2m-3)=1
t=
1
2m-3
这个我觉得题目错了...答案到最后t就不见了>.<
12题

pq=10
当他是right angle triangle的话
oq=8 pq=10 op=6
gradient=
-y intercept
x intercept
=
-(-8)
-6
=-8/6
=-4/3
用coordinate
It is given that the equation of a straight line which passes through point (0,8) is y = -4x + c.
Find the point of intersection of the straight line and the x-axis.
y=-4x+8
y=0, 0=4x+8
-2=x
(-2,0)
It is given that m varies inversely with n and m = 20 when n = 2.
Calculate the value of n when m = 5.
m=
k
n
20=k/2
40=k
when m=5
5=40/n
n=8
这题不是很会><你看看><