Question

19-(x-6)×(2x+1)=(x-5)×(x-1) решите уравнение

Answer 1

19-(2х²+х-12х-6)=х²-5х-х+5
19-2х²+11х+6=х²-6х+5
-3х²+17х+20=0    /*-1
3х²-17х-20=0
Д=289+240=529
х1=(17+23)/6=40/6
х2=(17-23)/6=-1