2/15:(1/5x-1/3)=1/24+1/12
2/15:(1/5x-1/3)=1/24+2/24
2/15:(1/5x-1/3)=3/24
2/15:(1/5x-1/3)=1/8
1/5x-1/3=2/15:1/8
1/5x-1/3=2*8/15*1=16/15
1/5x=16/15+1/3
1/5x=21/15(сократить)—>7/5
x=7*5/5*1=7
x=7
Р(А)=0,7*0,8+0,7(1-0,8)+(1-0,7)*0,8=0,56+0,14+0,24=0,94 (94\%)
2014×2016/2015×2017=4060224/4064255====0,999
400-170=230, 400-270=130,х-80=630 630+80=710,х-80=450 450+80=530,х:6=100 100*6=600,х:6=200 200*6=1200
Ответ:
2.88*35/72=(2.2х-5/12)×16
72/25×35/72=35.2х-20/3
7/5=35.2х-20/3
35.2х=121/15
Х=11/48
(1.11/24+13/36х)×1.44-8/15×0.5625=0
(37/800+13/36х)×1.44-8/15×0.5625=0
333/5000+13/25х-3/10=0
13/25х=1167/5000
25х=13:1167/5000
Х=2600/1167