Operations with Signed Numbers: Difficult Problems with Solutions

Problem 1
Add:
(-12) + (+11) + (-8) + (+39) =
Problem 2
-20 - 22 ⋅ (-1) =
Problem 3
(-6) - (+6) - (-8) =
Problem 4
Carry out the operations
(-5) ⋅ (-4) + (+3) ⋅ (-2) =
Problem 5
(-15) ⋅ [-3 + (-15)] : (+5) =
Problem 6
-18 : [-20 - (30 - 56)] =
Problem 7
-2 ⋅ (-4.5) ⋅ (-5) =
Problem 8
[tex](-1) - \left(-5\frac{1}{2}\right) \cdot \left(+\frac{4}{11}\right) =[/tex]
Problem 9
Calculate |a| - |b| + |c| = , when a = -8, b = -5, c = 1
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