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