18. The absolute value of number 5 is 5, which is itself; the absolute value of number – 5 is 5, which is its opposite number; the above comes from the theorem that the absolute value of non negative number equals itself, and the absolute value of non positive number equals its opposite number__________ The absolute value of negative number - B is________ The absolute value of negative number 1 + A is________ The absolute value of a + 1___________ . 19. It is known that | a | = 3, | B | = 5, and a

18. The absolute value of number 5 is 5, which is itself; the absolute value of number – 5 is 5, which is its opposite number; the above comes from the theorem that the absolute value of non negative number equals itself, and the absolute value of non positive number equals its opposite number__________ The absolute value of negative number - B is________ The absolute value of negative number 1 + A is________ The absolute value of a + 1___________ . 19. It is known that | a | = 3, | B | = 5, and a

18. The absolute value of number 5 is 5, which is itself; the absolute value of number – 5 is 5, which is its opposite number; the above comes from the theorem that the absolute value of non negative number equals itself, and the absolute value of non positive number equals its opposite number. In this sentence, the absolute value of positive number – A is - A; the absolute value of negative number – B is B; the absolute value of negative number 1 + A is - A-1, and the absolute value of positive number – a + 1 is - A + 1
19. It is known that | a | = 3, | B | = 5, and a