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A question about the champion of mathematics in the first volume of the seventh grade
1 1 original formula = a+c-a-b = c-b.

12 x-3 when x≥3.

3-x when x≤3.

Besides, your seventh and tenth questions are wrong.

7: x takes a negative integer.

So x=-3 or x=-4.

10 should take values and 2.

∵-2

I hope the answer will help you.