3,4+2у=7*(у-2,3)
3,4+2у=7у-16,1
2у-7у=-16,1-3,4
-5у=-19,5
у=3,9
609 - 100\%
х - 13\%
х=79,17 (это 13\%)
609+79, 17= 688,17
1)2/5+13/15=6/15+13/15=19/15
2)19/15*6=38/5=7,6
(2х-5)^2(х-5) = (2х-5)(х-5)^2
(2х-5)^2(х-5) - (2х-5)(х-5)^2=0
(2x-5)(x-5)((2x-5)-(x-5))=0
(2x-5)(x-5)(2x-5-x+5)=0
(2x-5)(x-5)(x)=0
(x-2.5)(x-5)(x)=0
X1=2.5
X2=5
<span>X3=0</span>
D=169-4*7*15=169-120=49
<span>X1=(13-7)/4=5/4=1,25</span><span>X2=(13+7)/4=5</span><span>a=1,25</span>