Ответ:1) x = -2 2) x = 31/7
Пошаговое объяснение:
1) 5.6 - 3(2-0.4x) = 0.4(4x+1)
5.6 - 6 + 1.2x = 1.6x + 0.4
1.2x - 1.6x = 0.4 +6 - 5.6
-0.4x = 0.8 | /-0.4
x = -2
2) (x+2)/9 = (x-3)/2
(x+2)/9 = (x-3)/2 | *18
2(x+2) = 9(x-3)
2x + 4 = 9x-27
2x - 9x= -27 - 4
-7x = -31 | /-7
x = 31/7
5,6 - 3(2 - 0,4х) = 0,4(4х + 1)
5,6 - 6 + 1,2х = 1,6х + 0,4
1,2х - 0,4 = 1,6х + 0,4
1,2х - 1,6х = 0,4 + 0,4
-0,4х = 0,8
х = 0,8 : (-0,4)
х = -2
(х + 2)/9 = (х - 3)/2
9(х - 3) = 2(х + 2)
9х - 27 = 2х + 4
9х - 2х = 4 + 27
7х = 31
х = 31/7
х = 4 3/7
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Ответ:1) x = -2 2) x = 31/7
Пошаговое объяснение:
1) 5.6 - 3(2-0.4x) = 0.4(4x+1)
5.6 - 6 + 1.2x = 1.6x + 0.4
1.2x - 1.6x = 0.4 +6 - 5.6
-0.4x = 0.8 | /-0.4
x = -2
2) (x+2)/9 = (x-3)/2
(x+2)/9 = (x-3)/2 | *18
2(x+2) = 9(x-3)
2x + 4 = 9x-27
2x - 9x= -27 - 4
-7x = -31 | /-7
x = 31/7
Пошаговое объяснение:
5,6 - 3(2 - 0,4х) = 0,4(4х + 1)
5,6 - 6 + 1,2х = 1,6х + 0,4
1,2х - 0,4 = 1,6х + 0,4
1,2х - 1,6х = 0,4 + 0,4
-0,4х = 0,8
х = 0,8 : (-0,4)
х = -2
(х + 2)/9 = (х - 3)/2
9(х - 3) = 2(х + 2)
9х - 27 = 2х + 4
9х - 2х = 4 + 27
7х = 31
х = 31/7
х = 4 3/7