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Senior one practices math every day. Guess how to write.
Practice guessing every day and fill in the first grade math as follows:

1, guess: fill in a number: 2, 4, 6, 8, _ _, and fill in a letter: a, b, c, d, _ _.

2. Fill in the blank: Fill in the blank with the correct number: 3+2=__, and write the inverse operation of the plus sign: 10-__=5.