1)x^2/3 - 3 = 0
x^2/3 = 3
х^2 = 9
x1=3
x2= - 3
2)b1=3*2-1 = 6-1 = 5
b2 = 3*2^2 - 1 = 12-1 = 11
q=b2/b1 = 11/5
3)((a+1)/2a)/((a^2-1)/4a^2)) = (a+1)*4a^2/2a*(a^2-1) = (a+1)*2a/(a-1)(a+1) = 2a/a-1
376-x=7*8
x=376-x=7
*
_ 8
56
X=376-56
x=320
376-320=56
784-896+256+125=269
...............................................
P=2*p
p=20+50=70
P=70*2=140