Log по основанию 2 <span>(4-x)*<span> (1-2x) = </span><span>Log по основанию 2 9 </span></span>
3. 6(1 - cos²x) - cosx - 5 =0; 6 - 6cos²x - cosx - 5 = 0; 6cos²x - cosx -1 = 0
cosx = y; 6y² + y - 1 = 0; y= - 1/2; y = 1/3;
cosx = +- 2π/3 +2πn, n∈Z. cosx = arccos1/3 +2πn; n∈z.
1)
X=-2; 2*(-2)^3-2/2=-17
x=0 ; 2*0^3+2*0=0
x=1; 2*1^3+1/2= 2.5
6(8x+5)=0
48x+30=0
48x=30-0
48x=30
x=48:30
x=1,6
-8(2x-0,5)=0
16x-40=0
16x=40+0
16x=40
x=40:16
x=2,5