Solving three math problems 1. It is known that a and B are opposite to each other, m and N are reciprocal to each other, and C = 2. Find the value of 2A + 2B + Mn / C 2. If a is less than 0, B is less than 0 and a is less than B, try to determine whether the numbers represented by the following expressions are positive or negative? (1)a+b (2)a-b (3)-a-b (4)b-a 3. Given A-3 + B-4 = 0, find the value of a + B / ab

Solving three math problems 1. It is known that a and B are opposite to each other, m and N are reciprocal to each other, and C = 2. Find the value of 2A + 2B + Mn / C 2. If a is less than 0, B is less than 0 and a is less than B, try to determine whether the numbers represented by the following expressions are positive or negative? (1)a+b (2)a-b (3)-a-b (4)b-a 3. Given A-3 + B-4 = 0, find the value of a + B / ab

It is known that a and B are opposite to each other, m and N are reciprocal to each other, C = 2, find the value of 2A + 2B + Mn / C, a + B = 0mn = 1C = 22a + 2B + Mn / C = 2 (a + b) + Mn / C = 1 / 22. If a is less than 0, B is less than 0 and a is less than B, try to determine whether the number represented by the following formula is positive or negative? (1) a + B (2) A-B (3) - A-B (4) B-A (1) negative