2 Упростите выражение, используя свойства сложения:
1) (9 + а) + 11; 3) (а + 17) + 23; 5) (18+ х) + 12;
2) (16 + b) + 4; 4) (b + 22) + 18: 6) (43 +y) + 57.​
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