7х + 54 = 131
7х = 131 - 54
7х = 77
Х = 77 : 7
х = 11
5д.0ед.=50,2д.2ед.=22,3д.9ед.=39,1д.4ед.=14,9ед.=9,10д.0ед.=100
1) 185*5=925
2) 136/8=17
3) 925-17= 908
Ответ: 908
100:(18+(82-10х):6)=5
18+(82-10х):6=100:5
18+(82-10х):6=20
(82-10х):6=20-18
(82-10х):6=2
82-10х=2*6
82-10х=12
10x=82-12
10x=70
<span>x=7</span>
<span>37,5-X+12 3/4=5,35</span>
<span>37 1/2-х+12 3/4=5 7/20</span>
<span>75/2-х+51/4=107/20----------приведем общему знаменателю-20</span>
<span>750-20х+255=107</span>
<span>1005-20х=107</span>
<span>20х=1005-107</span>
<span>20х=898</span>
<span>х=44,9</span>