Log3 3 =1
log3 27=log3 3^3=3
7^log3 27/7^log3 3=7^3/7^1=7^2=49
12x-7y=2 |*2
9x+14y=7
24x-14y=4
9x+14y=7
33x=11
x=11\33
12*11\33-7y=2
-7y=2-4
-7y=-2
y=2\7
Ответ:(11\33;2\7)
х³ - x² = 0
х²(х - 1) = 0
х² = 0 или х - 1 = 0
<span>х = 0 или х = 1</span>
x³ - x = 0
х(х² - 1) = 0
х(х - 1)(х + 1) = 0
<span>х = 0</span> или х - 1 = 0 или х + 1 = 0
<span>х = 1</span> или <span>х = -1</span>
4y - y³ = 0
y(4 - y²) = 0
y(2 - y)(2 + y) = 0
<span>y = 0 </span>или 2 - y = 0 или 2 + y = 0
<span>y = 2</span> или <span> y = - 2</span>
5z³ - 5z = 0
5z(z² - 1) = 0
5z(z - 1)(z + 1) = 0
5z = 0 или z - 1 = 0 или z + 1 = 0
<span>z = 0 или z = 1 или z = - 1</span>
z - 9z³ = 0
z(1 - 9z²) = 0
z(1 - 3z)(1 + 3z) = 0
<span>z = 0 </span> или 1 - 3z = 0 или 1 + 3z = 0
<span> z = 1/3 </span> или <span> z = -1/3 </span>