Ответы
Ответ:
1) 6 4/5 или 6,8
2) 3
3) -4
4) -3
5) 6
6) 3
7) 1/2 или 0,5
8)
Объяснение:
1) х/2 + х/8=17/4
4х + х = 34
5х=34
х=34/5=6 4/5 = 6,8
2) (х+1)/4 + х/3 = 2
3*(х+1) + 4х = 24
3х + 3 +4х = 24
7х = 24-3
7х = 21
х=3
3) (х - 2)/3 = (2+3х)/5
5*(х - 2) = 3*(2 + 3х)
5х - 10 = 6 +9х
5х - 9х = 6 + 10
-4х = 16
х = -4
4) (х+3)/2 - (х - 4)/7 = 1
7*(х + 3) - 2*(х - 4) = 14
7х+21 - 2х + 8 = 14
5х = 14-29
5х = - 15
х = -3
5) (х + 4)/4 - (х - 3)/6 = 2
3*(х + 4) - 2*(х - 3) = 24
3х +12 - 2х + 6 = 24
х = 24-18
х = 6
6) (5х + 2)/12 + (2х - 1)/15 = (х + 4)/4
5*(5х + 2) + 4*(2х - 1) = 15*(х + 4)
25х + 10 + 8х - 4 = 15х +60
33х -15х = 60 - 6
18х = 54
х =54:18 = 3
7) (3х-2)/3 - (2х + 1)/6 = х - 1
2*(3х - 2) - (2х+1) = 6*(х - 1)
6х - 4 - 2х - 1 = 6х -6
4х - 6х = -6 +5
-2х= - 1
х = 1/2 = 0,5
8) (7х - 3)/3 - (4х + 2)/2 + (5 - 3х)/8= 3
8*(7х - 3) - 12*(4х +2 ) + 3*(5 - 3х) = 24*3
56х - 24 - 48х - 24 + 15 - 9х =72
-х = 72 + 33
х = -105