求高手帮忙~~~~数学2道题~~~

1.a total of x touy bus to a certain museum. if there were y tourists on each bus, which of the following expresses the number of buses used?

A。xy
B. x/y
C.y/x
D.x-y
E.y^x
试着回复，B
2.A bar over a sequence of digits in a decimal indicates that the sequence repeats indefinitely. what is the value of (10^4-10^2)(0.0012)?  S: 12上面有个横线

A.0
B.0.12(12上面有横线)
C.1.2
D.10
E.12
试着回复，E
约等于10^2(10^-1)*12*10^-4=99*12*10^-2
可以算出结果约等于12

1.a total of x touy bus to a certain museum. if there were y tourists on each bus, which of the following expresses the number of buses used?

A。xy
B. x/y
C.y/x
D.x-y
E.y^x
一共有x个游客坐bus去博物馆。如果每辆车上坐y个人，问需要多少辆车的表达式。
这个好像不需要过程
x人      y人/车
直接可以看出用车辆为x/y

2.A bar over a sequence of digits in a decimal indicates that the sequence repeats indefinitely. what is the value of (10^4-10^2)(0.0012)?  S: 12上面有个横线

A.0
B.0.12(12上面有横线)
C.1.2
D.10
E.12
题目的第一句话就是告诉了你无限循环小数的表示方法是：一根横线加在一个小数数列的需要表示无限循环的几个数字的上面。（太拗口了，你可以放狗搜一下无限循环小数，我不知道怎么用键盘表示出那个上划线）
第二句话就是问(10^4-10^2)*0.0012121212 .....  <这里12无限循环>
其实无限循环在这里没有什么实际意义，你可以直接把这个数近似为0.0012
所以推出10^2(10^2-1)*12*10^(-4)
=10^(-2)*99*12
推出近似值=12