X+186 = 300
x = 300-186
x = 114
Проверка : 114+186 = 300
300 = 300
Ответ : 114.
~•~•~•ZLOY_TIGROVSKIY~•~•~•
<span>(4х-3)(4х+3)-(4х-1)²=3х,
16х</span>²-9 - 16х²+8х-1 - 3х = 0,
5х - 10 = 0,
5х = 10,
х = 2,
16с² - 49 = 0,
16с² = 49,
с = +/- √49/16,
с = +/- 7/4,
с1 = 1 3/4 (или 1,75),
с2 = - 1 3/4 (или -1,75),
0,21; 3,59 ; 2,17 ; 8,74 ; 4, 96 ; 2, 84