A)2√2/√2√2=2√2/2=√2
б)6√3/√3√3=6√3/3=2√3
в)√(x-y)/√(x-y)√(x-y)= √(x-y)/(x-y)
г)(а+b)√(a+b)/√(a+b)√(a+b)=(a+b)√(a+b)/(a+b)= √(a+b)
д)(х+3)√(х²-9)/√(х²-9)√(х²-9)=(х+3)√(х²-9)/(х²-9)=(х+3)√(х²-9)/(х+3)(х-3)= √(х²-9)/(х-3)
е)(а-b)√(a²-b²)/√(a²-b²)√(a²-b²)=(a-b)√(a²-b²)/(a²-b²)=(a-b)√(a²-b²)/(a-b)(a+b)= √(a²-b²)/(a+b)
ж)(1-√2)/(1+√2)(1-√2)= (1-√2)/(1-2)=- (1-√2)=√2-1
з) (1+√2)/(1+√2)(1-√2)= (1+√2)/(1-2)= -(1+√2)=-1-√2
и)√3(√3+5)/(√3+5)(√3-5)=√3(√3+5)/(3-25)= √3(√3+5)/(-22)=-√3(√3+5)/22
к)а(√а+а)/(√а-а)(√а+а)=а(√а+а)/(а-а²)
Если график пересекает ось Х, то y=0
![2x^2-5x+2=0 \\ \\ D=5^2-4*2*2=25-16=9=3^2 \\ \\ x_1= \frac{5+3}{2*2} =2 \\ \\ x_2= \frac{5-3}{2*2} =0.5 \\ \\ x_1+x_2=2+0.5=2.5 \\ \\ OTBET: \ 2.5](https://tex.z-dn.net/?f=2x%5E2-5x%2B2%3D0+%5C%5C++%5C%5C+D%3D5%5E2-4%2A2%2A2%3D25-16%3D9%3D3%5E2+%5C%5C++%5C%5C+x_1%3D+%5Cfrac%7B5%2B3%7D%7B2%2A2%7D+%3D2+%5C%5C++%5C%5C+x_2%3D+%5Cfrac%7B5-3%7D%7B2%2A2%7D+%3D0.5+%5C%5C++%5C%5C+x_1%2Bx_2%3D2%2B0.5%3D2.5+%5C%5C++%5C%5C+OTBET%3A+%5C+2.5)
30\% - 7.2
100\% - x
X =100×7.2/30=24
24 -30\%
X - 100\%
X=100×24/30=80
2х-3≥0
х+2≥0
Корень 2х-3=корень х+2
2х-3=х+2
2x-x = 2+3
x = 5