1、Six balls marked 1-6. Pick one and then put it back and then pick one randomly. If the sum of two is 8, what the liability of one of two balls the number is 5?
A 1/6 B)1/5 C)1/3 D)2/3 E)some fraction.
I choose A but not sure. Guess it is wrong. I got 49 in math. I guest this one is wrong and it is my second.
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2/5
（3，5）（5，3）（4，4）（2，6）（6，2）
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2、
Five boxes maximum capacity currently hold pieces
90 70
80 70
50 30
80 50
40 40
rearrange it so that the maximum capacity - holding pieces for all five are the same. So second box should be ? (62)
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62
先将多的挑出来。平均分：（20+10+20+30+0）/5=16
这时的各个盒子的差就是16。
第二个盒子：80-16=62
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3、Piont (0, 10), (-4, 9) and (a, 13) are on one line. What is a? --12
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12
两点式的出方程：Y=（1/4）X + 10
将（A，13）带入，可得A=12
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4、
y=(x-1)(1-k/2)+(2-k)*x/2 What is the slope of line? 1-k
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2-K
分解方程后，将X提取出来
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今天到此。明天再补充！
希望以此抛砖引玉。
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