<em>18=2х+28
-2х=18-18
2х=-18+18
2х=0
х=0</em>
A+b=95
(a-b)/b=3
a=95-b
95-2b=3b
b=19
1) a=52+19=71
2) a=51+19=70
3) a=57+19=76
4) a=54+19=73
5) a=56+19=75
4x+6y-30=0, x=0
6y=30
y=5
Ответ: 5
<span> 6x-2y=3
х=(3+2у):6
у=(3-6х):(-2)</span>
√2cosxcosπ/4+√2sinxsinπ/4-cosx=√3/2
√2*1/√2*cosx+√2*1/√2*sinx-cosx=√3/2
cosx+sinx-cosx=√3/2
sinx=√3/2
x=(-1)^n*π/3+πn,n∈Z