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10 Efectuați:
a –9 – (–6) + 8;
b –1 – (+3) – 6;
c +12 – (–9) – 2;
d +6 – (–4) + 10;
e –21 – (+17) – (–2);
f 0 – (–8) – (+8);
g +11 – (–9) – (+5);
h 4 – (+3) + (–7);
i 0 – (+9) + (–9);
j –6 – [(–4) – (–5)];
k –4 – [(+10) + 3];
l – [9 – (–9)] – 5