Question

Сделайте пожалуйста, срочно нужно!

Answer 1

x²-3x=0; x(x-3)=0; x=0   x=3

3x²-27=0; 3x(x-9)=0; x=0   x=9

x²=100; x=10  x=-10

x²-36>0; x²>36             -6                        6
                             ====o---------------------o=====>
                                        x∈(-∞;-6)∪(6;+∞)


x²<49
                                    -7                        7
                            --------o===========o---------->
                                      x∈(-7;7)

$frac{7^3*7^5}{7^9}= frac{7^8}{7^9}= 7^{-1}=frac{1}{7}$
$frac{ 3^{-4}*3^7 }{3^6}= frac{3^3}{3^6}= 3^{-3}= frac{1}{27}$
$frac{ 5^{-6}*5^8 }{125}= frac{5^2}{5^3}= 5^{-1}= frac{1}{5}$
$frac{ 2^{-3}* 2^{-7} }{ (2^{2}) ^{-4} }= frac{ 2^{-10} }{ 2^{-8} } = 2^{-2}= frac{1}{4}$