Выполните сложение, выбирая удобный порядок вы- числений:
1) (486 + 351) + 514;
2) 2 786 + 871 + 129;
3) 147 + 256 + 353 + 244;
4) (3 681 + 11 388) + (4 319 + 1 612).​
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