Вычислите наиболее рациональным способом:
а) 3,17+10,2 +0,83 +9,8
в) 15,21 - 3,9 — 4,7+6,79;
б) 4,11+15,5 +0,89 +4,4;
г) – 4,27 +3,8- 5,73 - 3,3.​
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