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First-grade mathematics Huanggang small champion answer
Separate the data from the middle, 1, 2, 3, 4 as a group.

A group of 5, 6, 7 and 8 will make up five equations, so subtract each number in the previous group from the next group.

That is 5- 1 = 6-2 = 7-3 = 8-4.