The first semester of junior high school on the rational number addition and subtraction mixed operation problem! calculation: 1.23－17－（-7）+（-16） 2.0 + 1 - [(- 1) - (minus three seventh) - (+ 5) - (minus four seventh)] + | - 4| 3.（-2.5）－（+2.7）－（-1.6）－（-2.7）+（+2.4） Simplification: |a-b | + |a + C | - |b-c | + |2c| When a = - 3, C = - 2, find the value of the above formula be careful

The first semester of junior high school on the rational number addition and subtraction mixed operation problem! calculation: 1.23－17－（-7）+（-16） 2.0 + 1 - [(- 1) - (minus three seventh) - (+ 5) - (minus four seventh)] + | - 4| 3.（-2.5）－（+2.7）－（-1.6）－（-2.7）+（+2.4） Simplification: |a-b | + |a + C | - |b-c | + |2c| When a = - 3, C = - 2, find the value of the above formula be careful

1.23－17－（-7）+（-16）=23-17+7-16=6+7-16=13-16=-3
2.0 + 1 - [(- 1) - (minus three seventh) - (+ 5) - (minus four seventh)] + | - 4|
=1-[-1+3/7-5+4/7]+4=1-(-5)+4=10
3.（-2.5）－（+2.7）－（-1.6）－（-2.7）+（+2.4）
=-2.5-2.7+1.6+2.7+2.4=1.5
Simplification: | A-B | + | a + C | - | - B-C | + | - 2C | = | - 3-B | + | - 3-2 | - | - B + 2 | + 4 = | - 3 + B | - | - B + 2 | + 9
When a = - 3, C = - 2, find the value of the above formula

Mixed operation of 23-17 - (- 7) + (- 16) rational number

23-17-（-7）+（-16）
=23-17+7-16
=6+7-16
=13-16
= -3

Given that the absolute value of a is equal to 2, then what is A-1 equal to

If the absolute value of a is 2, then A-1 = 1 or - 3

An absolute rational number subtraction problem
|1/9-1/10|+|1/8-1/9|+|1/7-1/8|+···+|1-1/2|

|1/9-1/10|+|1/8-1/9|+|1/7-1/8|+···+|1-1/2|
=1/9-1/10+1/8-1/9+1/7-1/8+...+1-1/2
=-1/10+1
=9/10