Question

(387 - 41) - (81 + 13)
(83 + 81) - (81 + 13)
281 - (-37) + 83 - 181
87- (-13) + (-21) - 79
(-172) + (-43) + 72 - 57

Answer 1

1. \(\left(387-41\right)-\left(81+13\right)\)

\(=346-94=252\)

 

2. \(\left(83+81\right)-\left(81+13\right)\)

\(=83+81-81-13\)

\(=70\)

 

3. \(281-\left(-37\right)+83-181\)

\(=281-181+37+83\)

\(=100+120=220\)

 

4. \(87-\left(-13\right)+\left(-21\right)-79\)

\(=87+13-21-79\)

\(=100-100=0\)

 

5. \(\left(-172\right)+\left(-43\right)+72-57\)

\(=-172+72-43-57\)

\(=-100-100=-200\)

Answer 2

b: =83+81-81-13=70

2: =281+37+83-181=100+120=220