Ответы на вопрос:
3/14x*39-2/26*39=13 1/2 3/14*39=117/14=8 5/14 2/26*39=78/26=3 8 5/14x-3=13 1/2 8 5/14x=13 1/2-3 8 5/14x=10 1/2 x=10 1/2 ÷ 8 5/14 x=10/2 ÷ 40/14= 140/80=14/8=1 6/8=1 3/4x= 1
Пошаговое объяснение:
(a + b)*5 + 9a + 3b = 5a + 5b + 9a + 3b = 14a + 8b = 14*3 + 8*2 = 42+16 = 58
13*(a + b) - 7b + 4a = 13a + 13b - 7b + 4a = 17a + 6b = 17*3 + 6*2 = 51+12 = 63
6*(x + a) - 5a = 6x + 6a - 5a = 6x + a = 6*4 + 3 = 24 + 3 = 27
30x - (5x + 4x) = 30x - 5x - 4x = 21x = 21*4 = 84
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