Раскройте скобки: – (а – b); – (2a + 3c – 4b); – (2 – a – 4n); – 2*( 3 + 2c); – 3*(4c – 2a); 5*(4 – 2c); – 2*(3 – 3n + 4m); – 4* (a – 4c + 6d - n). Решите примеры: а. 5,7 + (8,1 – 4,7) = ; б. 3,39 – (1,39 – 4,5) = ;в. 3,7 - (-5,3 + 3,7) = ; г. 4,9 - (4,9 - 2,4) =.
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