Find a rule to fill in the first grade of digital primary school - Training Enrollment Network

Find a rule to fill in the first grade of digital primary school

I:3-3(- 1)+ 1(2)-2(-3)+3( 1)- 1

2: 4- 1 (3)+0 (-2)+2 (4)- 1 (0)+3

Three: 2+3 (4)-1(3)-2 (6)-1(2)+3

Four: 5-1(6)-2 (2)+2 (3)+1(5)-1

Every two numbers in the law add and subtract the same number.

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