0,8a=0,25b
0,75b=3*0,25b=3*0,8a=2,4a=2,4*10=24
Х^2 - 5 = а
а^2 - 3а - 4 = 0
D = 9 + 16 = 25 = 5^2
a1 = ( 3 + 5 ) : 2 = 4
a2 = ( 3 - 5 ) : 2 = - 1
X^2 - 5 = 4
X^2 = 9
X1,2 = + ; - 3
X^2 - 5 = - 1
X^2 = 4
X1,2 = + ; - 2
Ответ 2 ; 3 ; - 2 ; - 3
<span>а<span>)
a+b+c*(a+b)= (a+b)(c+1)
</span>б<span>)
ac+bc-2ab-2bd= c(a+b)-2b(a+b)=(a+b)(c-2b)
</span>в<span>)
xy2-by2-ax+ab+y2-a=y2(x-b+1)-a(x-b+1)= (y2-a)(x-b+1)
</span>г<span>)
x2+3x+2=x2+2x+x+2=x(x+2)+(x+2)=(x+1)(x+2)</span></span>