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5. Calculati:
a) | +5| +|-9|-|-3|+|+8 |;
b) 1-2+3 - 4+5-6+ ... + 101 – 102;
c) 3×(-2)×(- 5)^2 – 3 ×(-4)^3. (-2) × [(-10)^11:(+ 10)^8 – 90].​