1)x^2-7x+2=0
a=1
b=-7
c=2
Дискриминант=b^2-4ac=49-8=41
x1=7+√41/2
x2=7-√41/2
2)х^2-х-30=0
a=1
b=-1
c=-30
Дискриминант=1+120=121
х1=1+11/2=6
х2=1-11/2=-5
![log_{2}^{2}x+2log_{2}x>3\\log_{2}x=m\\ \\m2+2m-3>0\\(m +3)(m-1)>0](https://tex.z-dn.net/?f=log_%7B2%7D%5E%7B2%7Dx%2B2log_%7B2%7Dx%3E3%5C%5Clog_%7B2%7Dx%3Dm%5C%5C%20%5C%5Cm2%2B2m-3%3E0%5C%5C%28m%20%2B3%29%28m-1%29%3E0)
+ - +
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- 3 1
m < - 3 и m > 1
![1)log_{2}x <-3\\x<\frac{1}{8}\\2)log_{2}x>1\\ x>2](https://tex.z-dn.net/?f=1%29log_%7B2%7Dx%20%3C-3%5C%5Cx%3C%5Cfrac%7B1%7D%7B8%7D%5C%5C2%29log_%7B2%7Dx%3E1%5C%5C%20x%3E2)
ОДЗ : x > 0
Ответ : x ∈ (2 ; + ∞)
Увы, только с первым могу помочь(
x+y=4
-x+2y=2
x=4-y
-x+2y=2
x=4-y
-4-y+2y=2
x=4-y
-4-y=2
-y=2+4
-y=6
y=-6
x-6=4
x=4+6
x=10
<span>a) 9х^8-11х^8+2х^8=0
d) 5а^4b+5a^2ba^2-15ba^4</span>=<span>-5ba^4</span>