Даю 10 баллов! СРОЧНО!!!
Роскройте скобки и сведите подобные слогаемые:
1) 10а + (4-4а)
2) -(4b - 10) + (4 - 5b)
3) (14,2 - 5) - (12,2 - 5)
4) (-2,8 + 13) - (5,6+2,8) + (2,8 - 13)
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