92. Упросите выражение,используя свойства сложения: 1) (9 + a) + 11; 3) (a +17) + 23; 5) (18 + x) + 12; 2) (16 + b) + 4; 4) (b + 22) + 18; 6) (43 + y) + 57.
Даю:15бал​
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