Observe the following formulas: 12 + 21 = 33 = 11 × (1 + 2) 23 + 32 = 55 = 11 × (2 + 3) 59 + 95 = 154 = 11 × (5 + 9) Write a similar equation for two digit numbers with ten digits A and one digit B. according to this explanation, can you add the sum of any two digit number and the original number after transposing the position of any two digit number and ten digit number to the original number and divide it by 11? Calculate (- 4) △ 2, 4 △ 2, (- 4) △ 2. When you think a and B are rational numbers (B ≠ 0), is the following formula true? What rules can be summed up from this? ①-a/b=a/-b=- （a/b） ②-a/-b=a/b

Observe the following formulas: 12 + 21 = 33 = 11 × (1 + 2) 23 + 32 = 55 = 11 × (2 + 3) 59 + 95 = 154 = 11 × (5 + 9) Write a similar equation for two digit numbers with ten digits A and one digit B. according to this explanation, can you add the sum of any two digit number and the original number after transposing the position of any two digit number and ten digit number to the original number and divide it by 11? Calculate (- 4) △ 2, 4 △ 2, (- 4) △ 2. When you think a and B are rational numbers (B ≠ 0), is the following formula true? What rules can be summed up from this? ①-a/b=a/-b=- （a/b） ②-a/-b=a/b

For the two digit AB with ten digit A and one digit B, that is, 10a + B becomes a new two digit Ba after transposition, 10b + a (10a + b) + (10b + a) = 11a + 11b = 11 * (a + b) can be divided by 11 to calculate (- 4) / - 2,4 / - 2, (- 4) / - 2