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x<50, 整数, 末位为5, x的value?
1. thousandth unit of x4 is 1.
2. hundredth unit of x2 is 2.
我选A, 1推出只有35符合.而2推出15和35符合.
s t positive integers, are factors of n. Are the following factors of nst ?
1. st
2. (st)2
3. (s+t)
5个选项分别是none, 1, 2, 3和1+2. 应该选1的, 最后一道我来不及了选成1+2.
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