<span>3х+4(25-х)=91</span>
<span>3x+100-4x=91</span>
<span>-x=91-100</span>
<span>-x=-9</span>
<span>x=9</span>
( ( 2a + 7b ) : 3 ) + ( ( 3a - 14b ) : 6 ) = ( 2( 2a + 7b ) + ( 3a - 14b )) / 6 = ( 4a + 14b + 3a - 14b ) / 6 = 7a / 6
0 / 6 = 0
Ответ 0
(a-3√a)/(a-9)=(√a^2-3√a)/(√a-3)(√a+3)=√a(√a-3)/(√a-3)(√a+3)=√a/(√a+3)