3(3-2х)+27=2(3+2х) 3х+2,7=9(х-1,1) 0,2(5х-2)=0,3(2х-1)-0,9 срочно пжл!!! даю 15 баллов!!!
1) 9 - 6x +27 = 6 + 4x - 6x - 4 x = 6 - 9 - 27 - 10x = - 30 x = 3 2) 3x + 2,7 = 9x - 9,9 3x - 9x = - 9,9 - 2, 7 - 6x = 7, 2 x = - 1, 2 3) x - 0, 4 = 0,6x - 0, 3 - 0,9 x - 0,6x = - 0,3 - 0,9 + 0,4 -0,4x = - 0, 8 x = 2
2) -9.9-2.7=-7.2, а не 7.2
3)1х-0.6х=0.4х, а не -0.4х
Ой...
- 6x = - 12,6
x = 2, 1
1. 3(3-2х)+27=2(3+2х) 9-6х+27=6+4х 4х+6х=9-6+27 10х=30 х=3 2. 3х+2.7=9(х-1.1) 3х-2.7=9х-9.9 9х-3х=9.9-2.7 6х=7.2 х=1.2 3. 0.2(5х-2)=0.3(2х-1)-0.9 х-0.4=0.6х-0.3-0.9 х-0.6х=0.4-0.3-0.9 0.4х=-0.8 х=-2