Найдите значение буквенного выражения, используя свойства действий: 1) 12 + а + 97, при а = 8; 3; 2) 26 + b + 83, при b = 14; 7; 3) 49 + c + 38, при c = 51; 62; 4) (20+a) ⋅ 15, при а = 5; 4; 5) (25 - b) ⋅ 5, при b = 14; 7; 6)(8 - c) ⋅ 12, при c = 6; 3; помогите пж и спасибо
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