А) 2x-4=1
2x=5
X=5/2
Б) 6-2x=1/2
6-1/2=2x
12-1=4x
X=11/4
В) 2x-1=3
2x=4
X=2
<span>(х+5)(30-х)-х(35-х)=50</span>
<span>30х-х^2+150-5х-35х+х^2=50</span>
<span>-10х=-100</span>
<span>х=10</span>
<span>ответ:10</span>
0,6 * (-10)^3 - (-10)^2 - (- 10) = 0.6 * (-1000) - 100 + 10 = - 600 - 100 + 10 = - 700 +10 = -690
5n(5n-2)-(2-5n)²= -5n(2-5n)-(2-5n)²= (2-5n)(-5n-2+5n)= (2-5n)*(-2)= 2(5n-2)