21. Calculaţi: a)|-2|+|-7| 2; b)|–14|- |-2|4+7); c)||-3|-|-8||| 1:1-10);
d) ||8 - 41 +13/4-2):17; e) (1+21+|-2+|-31 +1+31):1-5
1)||-18+|-18|+|-18 +...+|-18 -|-324.
(este urgent ) dau corona
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