1) 4x^2≤25
4x^2 - 25 ≤0
(2х-5)×(2х+5) ≤ 0
4x-2x<7-3
2x<4
x=2
мы решили неравенство,то есть нашли х
6х²+5mx+m²=0
a=6
b=5m
c=m²
D=b²-4ac = 25m² - 24m² = m²
x₁ = -b-√D / 2a = -5m-m / 12 = - m/2
x₂ = -b+√D / 2a = -5m+m / 12 = - m/3
<span>{3х-2у=7 /х3
</span><span>{х+3у=6 /х2
</span><span>{9х-6у=21
</span><span>{2х+6у=12
</span>11х=33
х=3
9-2у=7
-2у=7-9
-2у=-2
у=1