12. 1) Вычисли: 72 + 6; 98 − 5; 8 + 31; 7 + 42; 26 + 3; 26 − 3; 9 + 31 − 9; 6 + 28 − 6. 2) Вычисли: 30 + 41; 50 + 23; 37 + 20; 37 − 20; 64 + 30; 64 − 30; 49 + 0; 49 − 0.

Question

Вопрос:

Accepted Answer

1) \(72+6=78\); \(98-5=93\); \(8+31=39\); \(7+42=49\); \(26+3=29\); \(26-3=23\); \(9+31-9=31\); \(6+28-6=28\).

2) \(30+41=71\); \(50+23=73\); \(37+20=57\); \(37-20=17\); \(64+30=94\); \(64-30=34\); \(49+0=49\); \(49-0=49\).

Ответ: 1) 78, 93, 39, 49, 29, 23, 31, 28; 2) 71, 73, 57, 17, 94, 34, 49, 49.