У= kx+m
<span>точки А(-10;20) и В(1;9)
</span>
{-10k+m= 20
{k+m=9
{k= 9 - m
{-10(9 - m)+m=20
-90+10m+m=20
11m= 110
m=10
k+m=9
k+10=9
k= -1
<em>у= -х+10</em>
<span>Tg пи( x+9 ) / 6= корень из 3
</span>пи( x+9 ) / 6 = пи/3 +пи*n n целое
x+9= 6/3 +6n
x=2+6n-9
x=6n-7 n целое
4^(x-3) - 71*2^(x-6) + 7 ≤ 0
2^(2x-6) - 71*2^(x-6) + 7 ≤ 0
(1/64)*2^(2x) - (71/64)*2^(x) + 7 ≤ 0
Замена: 2^(x) = t > 0
(1/64)*t^2 - (71/64)*t + 7 ≤ 0
t^2 - 71t + 448 ≤ 0
D = 3249 = 57^2
t1 = (71-57)/2 = 7 > 0
t2 = (71+57)/2 = 64 > 0
7 ≤ t ≤ 64
7 ≤ 2^x ≤ 64
log2(7) ≤ x ≤ 6
Решение во вложении
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