розв'яжіть рівняння 6 клас
1) 4(х-2) =2х
2) -(3х-2)=-х
3) 7(х-1)= 4х
4) 3(х+2)=2(х-1)
5) 2(-х-5)= -(х+1)
6) -5(3-х)=6(х+1)
Ответы
1) 4(х - 2) = 2х 2) -(3х - 2) = -х 3) 7(х - 1) = 4х
4х - 8 = 2х -3х + 2 = -х 7х - 7 = 4х
4х - 2х = 8 -3х + х = -2 7х - 4х = 7
2х = 8 -2х = -6 3х = 7
х = 8 : 2 х = -2 : (-2) х = 7/3
х = 4 х = 1 х = 2 целых 1/3
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
4) 3(х + 2) = 2(х - 1) 5) 2(-х - 5) = -(х + 1) 6) -5(3 - х) = 6(х + 1)
3х + 6 = 2х - 2 -2х - 10 = -х - 1 -15 + 5х = 6х + 6
3х - 2х = -2 - 6 -2х + х = 10 - 1 5х - 6х = 6 + 15
х = -8 -1х = 9 -1х = 21
х = 9 : (-1) х = 21 : (-1)
х = -9 х = -21