231. Найдите значение выражения, выбирая удобный порядок вычис-
лений:
1) (176 + 343) - 243;
4) 1 287 - (487 + 164);
2) (684 + 915) - 484;
5) 971 - (235 + 371);
3) (259 + 101) - 59;
6) 5 393 - (1 393 + 158).
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