gwd 14 求问一道数学题

caoyfok

If the units digit of the three-digit positive integer k is nonzero, what is the tens digit of k?

(1)     The tens digit of k + 9 is 3.

(2)     The tens digit of k + 4 is 2.

momo0919

A

加9 一定会进位··

amjustin

同意楼上意见,A