решите уравнения:
1)-x+7=6x
2)2( 7+9x)
3)10x+3(7-2x) = 13+2x
4)0.6x + 100 = 0.9x + 1
1)-x+7=6x
2)2( 7+9x)
3)10x+3(7-2x) = 13+2x
4)0.6x + 100 = 0.9x + 1
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Ответ:
1)-х+7=6х
-х-6х=-7
-7х=-7
Х=1
2)2(7+9х)=0
14+18х=0
18х=-14
Х=-14/18
Х=-7/9
3)0,6х+100=0,9х+1
0,6х-0,9х=1-100
-0,3х=-99
Х=330
4)10х+3(7-2х)=13+2х
10х+21-6х=13+2х
10х-6х-2х=13-21
2х=-8
Х=-4