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Solving math problems in the fourth grade of primary school. We should use the fourth grade problem-solving method to explain the problem-solving ideas.
The first question 432; The second question10; The third question 4320
Analysis:
1, choose the largest one to put 100, the second one to put 10, and the third one to put;
2. Since 0 can't put ten digits, put one digit, and choose the second smallest 1 to put ten digits;