(13,5-8,5)(13,5+8,5)/(73,5-68,5)(73,5+68,5)=5*22/5*142=11/71
Решение
5*(2∧2х) + 3*(2∧х)*(5∧х) - 2*5∧(2х) = 0
5*/((2/5)∧(2х)) + 3*((2/5)∧х) - 2 = 0
(2/5)∧х = у, у≥0
5у∧2 + 3у - 2 = 0
D = 9 + 4*5*2 = 49
y = (-3-7) / 10 = -1 ≤ 0 не удовлетворяет условию: у≥0
у = (-3 + 7) / 10 = 2/5
(2/5)∧х = 2/5
х = 1
Ответ: х = 1
(x-2)/(x+21)=x/(x+5)-1/3
3*(x-2)*(x+5)=3*(x+21)*x-(x+21)*(x+5)
3x²+9x-30=3x²+63x-x²-26x-105
x²-28x+75=0 D=484
x₁=25 x₂=3.
2а*6а^2+ b/3a = 2*0.5 * 6*0.5^2 + (-3/4) / 3*0.5 = 1 * 6*0.25 + (-3/4)*1.5 =
= 1.5 + (-3/4)*1.5 = 1.5 (1 - 3/4) = 1.5* (1/4) = 1.5*.25=0.375