[求助]PREP数学题

huangxiaoyan

What is the hundredths digit of the decimal Z?

1)The tenths digit of 100Z is 2.

2)The units digit of 1000Z is 2.

答案是E.

喝咖啡的狼

let Z = a.bcd

hundredths digit of Z = c

1) 100Z = abc.d => b=2

2) 1000Z = abcd => d=2

[此贴子已经被作者于2008-7-6 13:48:38编辑过]

veracao

1)The tenths digit of 100Z is 2.

1) 100Z = abc.d => b=2

不应该推出d=2么？

huangxiaoyan

多谢