Задание
Развернуть задание
Упростить выражение и найти его числовое значение:
1) 5*(3x – 7) + 2*(1 – x) при x = 1/26
2) 7*(10 – x) + 3*(2x – 1) при x = -0.048
1) 5*(3x – 7) + 2*(1 – x) при x = 1/26
2) 7*(10 – x) + 3*(2x – 1) при x = -0.048
Развернуть задание
Новое решение
Решение
1) 5*(3x – 7) + 2*(1 – x) = 15x – 35 + 2 - 2x = 13x – 33
при x = 1/26
13/26 – 33 = 1/2 – 33 = -32.5
2) 7*(10 – x) + 3*(2x – 1) = 70 - 7x + 6x – 3 = 67 – x
при x = -0.048
67 – (-0.048) = 67 + 0.048 = 67.048
при x = 1/26
13/26 – 33 = 1/2 – 33 = -32.5
2) 7*(10 – x) + 3*(2x – 1) = 70 - 7x + 6x – 3 = 67 – x
при x = -0.048
67 – (-0.048) = 67 + 0.048 = 67.048
1) 5*(3x – 7) + 2*(1 – x) = 15x – 35 + 2 - 2x = 13x – 33
при x = 1/26
13/26 – 33 = 1/2 – 33 = -32.5
2) 7*(10 – x) + 3*(2x – 1) = 70 - 7x + 6x – 3 = 67 – x
при x = -0.048
67 – (-0.048) = 67 + 0.048 = 67.048
при x = 1/26
13/26 – 33 = 1/2 – 33 = -32.5
2) 7*(10 – x) + 3*(2x – 1) = 70 - 7x + 6x – 3 = 67 – x
при x = -0.048
67 – (-0.048) = 67 + 0.048 = 67.048