Ответ ответ ответ ответ ответ ответ
(3m - 8)*4 = 5m - 7
12m - 32 = 5m - 7
12m - 5m = 32 - 7
7m = 25
m = 25 : 7
m = (3) 4/7
-30zx+60zy-70z=-10z*(3x-6y+7)
1.
а = с * sinα,
a = 26 * sin 67°23' = 26 * 0,9231 = 24,
b = c * cosα,
b = 26 * 0,3846 = 10,
2.
c = b : sinβ,
c = 28 : 0,5282 = 53,
a = √(c² - b²),
a = √(53² - 28²) = √(2809 - 784) = √2025 = 45,
3.
b = √(c² - a²),
b = √(29² - 21²) = √(841 - 441) = √400 = 20,
4.
c = b : cosα,
c = 63 : 0,9689 = 65,
a = √(c² - b²),
a = √(65² - 63²) = √(4225 - 3969) = √256 = 16