Form 5 数学题不会做~~！厉害的拜托进来帮我

laikokseng

remember (add sugar to coffee )

QKeitaroQ

回复  QKeitaroQ
那我在这祝你考到A+咯
别叫我名 发表于 2012-10-31 10:46 PM

    赫赫~谢谢~有问题的话我会再来打扰你

QKeitaroQ

remember (add sugar to coffee )
laikokseng 发表于 2012-10-31 11:22 PM

    i understand already~ thank you =D
不过这里不写华语会扣分哦~

warriorwj

回复  warriorwj


    为什么 TAN要-1呢？
dream-dream 发表于 2012-10-31 07:59 PM

其实不算 tan -1  这是代表 arctangent 的意思。。。
如果你是用 350/570 就是 按 shift 然后 按 tan。。。

QKeitaroQ

回复  QKeitaroQ
那我在这祝你考到A+咯
别叫我名 发表于 2012-10-31 10:46 PM

    呃，这个会吗？？
There are 8 white and 12 brown envelopes in a drawer. Ali put another y white envelopes into the drawer. One envelope is drawn at random from the drawer. If the probabiltity of drawing a white envelope is 3 over 5, find the value of y.~

P2PSYSTEM

回复 55# QKeitaroQ


    There are 8 white and 12 brown envelopes in a drawer. Ali put another y white envelopes into the drawer. One envelope is drawn at random from the drawer. If the probabiltity of drawing a white envelope is 3 over 5, find the value of y.~

(8+y)/(8+12+y)=3/5
8+y=12+3/5y
2/5y=4
4/(2/5)=y
y=10

niielle

是没有-ve的~
tan是在-ve ，所以是2nd,4th quadren=X
2个答案
用shift inverse tan 找basic angle
然后 用 180 和360 各减答案 ，

QKeitaroQ

回复  QKeitaroQ


    There are 8 white and 12 brown envelopes in a drawer. Ali put another y wh ...
P2PSYSTEM 发表于 2012-11-1 02:10 PM

    啊~会了会了~谢谢~你几岁了啊~还记得这些哦

QKeitaroQ

是没有-ve的~
tan是在-ve ，所以是2nd,4th quadren=X
2个答案
用shift inverse tan 找basic angle
然后 ...
niielle 发表于 2012-11-1 02:29 PM

    这题已经会了~谢谢

秀珳

按計算機就按得出來
按shift
然後tan
然後0.8523（negative不用加上去） = 40.44