1) {x²-3y=9
{x+y=3
x=3-y
(3-y)²-3y=-9
9-6y+y²-3y+9=0
y²-9y+18=0
D=81-4*18=81-72=9
y₁=9-3=3 x₁=3-3=0
2
y₂=9+3=6 x₂=3-6=-3
2
Ответ: х=0 у=3
х=-3 у=6
2) В₈=2⁻¹² В₁₀=2⁻¹⁴
{B₈=B₁ * q⁷ {2⁻¹²=B₁ *q⁷ {B₁=2⁻¹²/q⁷
{B₁₀=B₁ * q⁹ {2⁻¹⁴=B₁ * q⁹ {B₁=2⁻¹⁴/q⁹
2⁻¹² = 2⁻¹⁴
q⁷ q⁹
2⁻¹² = 2⁻¹² * 2⁻²
q⁷ q⁷ q²
2⁻² =1
q²
q²=2⁻²
q²=(2⁻¹)²
q=2⁻¹ =1/2=0.5
B₁= 2⁻¹² =2⁻¹²⁻(⁻⁷) =2⁻⁵= 1
(2⁻¹)⁷ 32
Ответ:В₁ = 1
32