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