数学:
1 a,b抽空一池水需要3小时,2小时,c灌满水要6小时。三者同时工作,多长时间抽空半池水
2股票分红:预期获利0。8每股,half of the income will give to shareholds and remaining to research department; if the income increase 0.1dollar, the sharehold will gain additional 0.4 dollar, now the share's gain is 1.1 per share, hwo much will a sharehold gain when he has 200 shares/
3 一个元,内切一个正方形,求阴影部分面积。阴影部分是正方形某个边和圆弧围起来的小块,大家画图可以知道,这个面积就是元的面积--正方形的面积,在除以4。
4 k#= k+1 when k is odd, = k-1 when k is even, then a#的平芳*b# is even?
1) a is even, 2) b is odd
5 which of the following is the largest: 1,10000,1/10/1/0.0001;1/0.00001
6 r and s divided by 7,reminder is 3, then what is the reminder of r^2*s divided by 7. answer is 6
7 jane buys x apples and y orangers, does she pay more for apple than orange?
1) every apple value is y+5 cents, every orange is x+5 cent.
2)x>y
8 to be continued.
|