27а3+8b3-27a318a2b
+12ab2+18a2b+12ab2+8b3
Б.6-6+3x+4x=7-x , 7x=7-x , 8x=7 , x=7/8. Г. 5+7-7x-5x=x-8 , 12-12x=x-8 , 20=13x , x=20/13
<span>((1-6х)(1+6х))/4 = 2 -(3х-1)^2;
1-36х^2=4(2-(3х-1)</span>^2);
1-36х^2=4(2-9х^2+6х-1);
1-36х^2=8-36х<span>^2+24х-4;
24х=-3;
х=-1/8</span>