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- Mathematics in the first year of college
Mathematics in the first year of college
To know whether the first grade is addition or subtraction, this question uses addition.
1+2+6+ 1= 10
8+ 1+2+8+ 1=20
5+ 1+8+5+ 1+8=28
7+5+4+7+5+4+5=(37)
5+7+○+5+7+○+5+7=87 (problematic)
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