<span>а) 11-3/2x+1/=5 ==> -3<span>/2x+1/=5-11=-6 ==> <span> /2x+1/=-6/-3=2 ==></span></span></span>
<span><span><span> ==> 1) 2x+1=2 ==> x=1/2</span></span></span>
<span><span><span> 2) 2x+1=-2 ==> x=-3/2</span></span></span>
<span><span><span><span>б) 17-4/3x-1/=9 ==> <span>-4/3x-1/=9-17=-8 ==> <span>/3x-1/=-8/-4=2 ==></span></span></span></span></span></span>
==> 1) 3x-1=2 ==> x=1
2) 3x-1=-2 ==> x=-1/3
1)170+12=182(р) заплатил Петя
2)170+182=352(р) заплатили Петя и Миша
3,12/1,3=2,4
3,105/0,27=11,5
63/1,8=35
0,115/0,15=3,41
3а=25*0,6
3а=15
<span>а=5
ответ-5</span>