279. Раскройте скобки и найдите значение выражения
А) -0,56+(3,8-2,44)
Б) -3,24-(-4,76-2,9)
В)2/7/15-(2/2/15-8/1/9)
280. Упростите выражение
(с+5,4)-(4,9+с)
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