Learn math+use math+learn math well+use math well = learn math for use.

Analysis:

1, the result is five digits, so the number = 1.

2. Add up with =4, it is not zero or even, and the thousand digits of the result are learning, and the four digits of the hundred digits add up to two digits at most, so use =8, then learning =2 or 7.

3. It holds when learning =2, with =8, for =4, number = 1 and good =6.

When learning =7, use =8, number = 1, for =6, good =6, which is the same as, so it is discarded.

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