Ex. 8. Efectuați:
a) + {-47 + 21 +81 + (56 + (- 72 + 36 + 12)]} + 29 - 33;
b) + 13 + {- 35 - 49 + 23+ [+ 82 + 35 + (- 92 + 17)]);
c) + 15 + {- 39 - 87 + 23+ [+ 52 + (-41 + 75 + 24)]};
d) {-84 + 71 +31 + [-43 + (-21 +45 +26)]} + 15 - 57;
e) - 23 + {-17 + 39 + 32 + (-69 + (-31 +57 + 36)]};
1) + (-47 +66 +42 + [- 72 + (+83 - 57 +56)]} + 29 - 98.

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