А)62,5\% т.к 100:(50+30)=1.25*50=62,5\%
Б)37,5\% (остаток)
X=(z/3)-y
y=(z/3)-x
Как-то так
Ответ:
(√5+1)^2+(√5-1)^2= 5+2 корень из 5 + 1 +5 + 1 - 2 корень из 5= 12
1.а) 3х² - 12х = 3x(x-4)
б) ab - 2a +b² - 2b = a(b-2) + b(b-2) = (a+b)(b-2)
в)4x² - 9 = (2x-3)(2x+3)
2.а)![\frac{15-5y}{9-y^{2}}=\frac{5(3-y)}{(3-y)(3+y)}=\frac{5}{3+y}](https://tex.z-dn.net/?f=%5Cfrac%7B15-5y%7D%7B9-y%5E%7B2%7D%7D%3D%5Cfrac%7B5%283-y%29%7D%7B%283-y%29%283%2By%29%7D%3D%5Cfrac%7B5%7D%7B3%2By%7D)
б)![\frac{m^{2}-4mn+4n^{2}}{m^{2}-4n^{2}}=\frac{(m-2n)(m-n)}{(m-2n)(m+2n)}=\frac{m-n}{m+n}](https://tex.z-dn.net/?f=%5Cfrac%7Bm%5E%7B2%7D-4mn%2B4n%5E%7B2%7D%7D%7Bm%5E%7B2%7D-4n%5E%7B2%7D%7D%3D%5Cfrac%7B%28m-2n%29%28m-n%29%7D%7B%28m-2n%29%28m%2B2n%29%7D%3D%5Cfrac%7Bm-n%7D%7Bm%2Bn%7D)
3.x³-64x=0
Решение:
x(x²-64)=0
x²-64=0
x²=64
±8