Решить уравнения. ♥ 1. 3х²+17х-6=0 2. 2х²-0,9х-0,35 3. 6х²-27х+12=0 4. 64х²-16х+1=0

1.  D=b²-4ac= 17²-4*3*-6=289+72=361   x1=-17-19/2*3=-36/6=-6
 2. D=0.9²-4*2*-0.35=0.81+2.8=3.61   x1=0.9-1.9/2*2=-1/4   x2=0.9+1.9/4=
     =2.8/4=0.7
 3. D= 27²-4*6*12=729-288=441  x1=27-21/2*6=6/12=1/2
     x2=27+21/12=48/12=4
 4.  (8x-1)²=0     8x-1=0   8x=1   x=1/8