Задание
Развернуть задание
Найти числовое значение выражения, предварительно упростив его:
1) (2c + 5d) – (c + 4d) при c = 0.4, d = 0.6
2) (3a – 4b) – (2a – 3b) при a = 0.12, b = 1.28
3) (7x + 8y) – (5x – 2y) при x = -3/4, y = 0.025
4) (5c – 6b) – (3c – 5b) при c = -0.25, b = 2 1/2
1) (2c + 5d) – (c + 4d) при c = 0.4, d = 0.6
2) (3a – 4b) – (2a – 3b) при a = 0.12, b = 1.28
3) (7x + 8y) – (5x – 2y) при x = -3/4, y = 0.025
4) (5c – 6b) – (3c – 5b) при c = -0.25, b = 2 1/2
Развернуть задание
Новое решение
Решение
1) (2c + 5d) – (c + 4d) = 2c + 5d – c – 4d = c + d
при c = 0.4, d = 0.6
0.4 + 0.6 = 1
2) (3a – 4b) – (2a – 3b) = 3a – 4b – 2a + 3b = a - b
при a = 0.12, b = 1.28
0.12 – 1.28 = -1.16
3) (7x + 8y) – (5x – 2y) = 7x + 8y – 5x + 2y = 2x + 10y
при x = -3/4, y = 0.025
2* (-3/4) + 10*0.025 = -1.5 + 0.25 = -1.25
4) (5c – 6b) – (3c – 5b) = 5c – 6b – 3c + 5b = 2c - b
при c = -0.25, b = 2 1/2
2 * (-0.25) – 2 1/2 = -0.5 – 2.5 = -3
при c = 0.4, d = 0.6
0.4 + 0.6 = 1
2) (3a – 4b) – (2a – 3b) = 3a – 4b – 2a + 3b = a - b
при a = 0.12, b = 1.28
0.12 – 1.28 = -1.16
3) (7x + 8y) – (5x – 2y) = 7x + 8y – 5x + 2y = 2x + 10y
при x = -3/4, y = 0.025
2* (-3/4) + 10*0.025 = -1.5 + 0.25 = -1.25
4) (5c – 6b) – (3c – 5b) = 5c – 6b – 3c + 5b = 2c - b
при c = -0.25, b = 2 1/2
2 * (-0.25) – 2 1/2 = -0.5 – 2.5 = -3
1) (2c + 5d) – (c + 4d) = 2c + 5d – c – 4d = c + d
при c = 0.4, d = 0.6
0.4 + 0.6 = 1
2) (3a – 4b) – (2a – 3b) = 3a – 4b – 2a + 3b = a - b
при a = 0.12, b = 1.28
0.12 – 1.28 = -1.16
3) (7x + 8y) – (5x – 2y) = 7x + 8y – 5x + 2y = 2x + 10y
при x = -3/4, y = 0.025
2* (-3/4) + 10*0.025 = -1.5 + 0.25 = -1.25
4) (5c – 6b) – (3c – 5b) = 5c – 6b – 3c + 5b = 2c - b
при c = -0.25, b = 2 1/2
2 * (-0.25) – 2 1/2 = -0.5 – 2.5 = -3
при c = 0.4, d = 0.6
0.4 + 0.6 = 1
2) (3a – 4b) – (2a – 3b) = 3a – 4b – 2a + 3b = a - b
при a = 0.12, b = 1.28
0.12 – 1.28 = -1.16
3) (7x + 8y) – (5x – 2y) = 7x + 8y – 5x + 2y = 2x + 10y
при x = -3/4, y = 0.025
2* (-3/4) + 10*0.025 = -1.5 + 0.25 = -1.25
4) (5c – 6b) – (3c – 5b) = 5c – 6b – 3c + 5b = 2c - b
при c = -0.25, b = 2 1/2
2 * (-0.25) – 2 1/2 = -0.5 – 2.5 = -3