(tg³x + tg²x) + ( -2tgx - 2) = 0
tg²x(tgx +1) - 2(tgx +1) =0
(tgx +1)(tg²x -2 ) = 0
tgx +1 = 0 или tg²x -2 = 0
tgx = -1 tg²x = 2
x = -π/4 + πk , k ∈Z tgx = +-√2
x = +-arctg(√2) + πn , n ∈Z
16х-24-12у+9=9
{16х-12у=24
{0.6х+0.2у=2,2 |*60
{16х-12у=24
{36х+12у=132
____________
52х=156
х= 3
108+12у=132
12у=24
у=2
От: (3;2)
100=10^2
0,01=10^-2
0,01*100^п+3=10^-2
10^2п*10^6=10^4*10^2п=10^4+2п=10^2п+4
0,01^п:10^2п:10^2=10^(-2п+2п)
10^2=10^0:10^2=1/100
(1.2-4×(-0.6))×(4×(0.6)+1.2)= 3.6×(-1.2)=-4.32