120___100%
X_____45%
X=120*0.45
X=54
Ответ:С)54слив
<span>7x-(x+3)=3(2x-1)</span>
<span>7x-x-3=6x-3</span>
<span>7x-x-6x=-3+3</span>
<span>0=0</span>
<span></span>
<span>x — любое число</span>
a)
5(x-3)-(6-2x)²=0
5(x-3)-(6-2x)(6-2x)=0
5(x-3)-2((3-x)2*(3-x)=0
-5(3-x)-4(3-x)(3-x)=0
(3-x)(-5-4(3-x)=0
(3-x)(-5-12+4x)=0
(3-x)(4x-17)=0
3-x=0 , 4x-17=0
X=3 4x=17
X= 17/4 = 4,25