= ( AX - AY ) + ( 5X - 5Y ) = A * ( X - Y ) + 5 * ( X - Y ) = ( X - Y ) * ( A + 5 )
11x - 8 = 69
11x = 69 + 8
11x= 77
x = 77/11
x= 7
7a + 4c - 7a² / a = ( 7a - 7a²) + 4c / a = 7a( 1 - a) + 4c / a
При a = 25, c = 5:
7a( 1 - a) + 4c / a = 175 × ( - 24) + 20 / 25 = (- 4200 + 20) / 25 = - 167,2
<span>tg +ctg =3. (</span><span>tg +ctg )</span>²=9
.tg²<span> +ctg</span>²<span> +2</span>·<span>tg ctg </span>=9 <span>tg ctg=1</span>
tg²<span> +ctg</span>²<span> +2=9
</span><span>tg²<span> +ctg</span>²=7
</span>
(х³у¹^5) ³
————— = х²у
х^7у -²^5
11²1\5
Ответ: 24,2