1. 3x+560=1190
3x=1190-560
3x=630
x=210
20/4=5
24/4=8
28/4=7
остальные просто запишите
<span>X·32-123=3013</span>
<span>32х=3013+123</span>
<span>32х=3136</span>
<span>х=98</span>
<span><span> c·210-900=12750</span></span>
<span><span>210с=12750+900</span></span>
<span><span>210с=13650</span></span>
<span><span>с=65</span></span>
<span><span><span>4860-R·62=2442</span></span></span>
4860-2442=62r
2418=62r
r=39
<span> 91260-320·b=74620</span>
<span>91260-74620=320в</span>
<span>16640=320в</span>
<span>в=52</span>
8:152 *100% ≈ 0,053 *100% = 5,3% ≈ 5% - концентрация соли
А)2,345
б)0,217
в)7,157
г)9,008
д)132,785
е)13,012
ж)5,325
з)7,021