1/х=1/у-1/z
1/z=1/y-1/x (умножим обе части уравнения на хуz)
xy=zx-zy
xy=z(x-y)
z=xy/(x-y)
Ответ:
Пошаговое объяснение:
24x + 8 = 15x - 100
24x - 15x = -100 - 8
9x = -108
x = -108 : 9
x = -12
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76 - 45x = 94x - 341
94x + 45x = 76 + 341
139x = 417
x = 417 : 139
x = 3
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62x - 256 = 114 - 38x
62x + 38x = 114 + 256
100x = 370
x = 370 : 100
x = 3,7
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351 - 92x = 51 - 72x
92x - 72x = 351 - 51
20x = 300
x = 300 : 20
x = 15
(х+2)/3-(2х-1)/6-х≥2
2х+4-2х+1-6х≥12
-6х≥7
6х≤-7
х≤-7/6
х∈(-∞;-7/6]
1. 640-80=560
2.560:7=80
3.490:7=70
4.560-80=480
5.480+70=550