1. {y=2
{3x-y=4
3x-2=4
x=2
(x;y) = (2,;2)
{2=2
{3*2-2=4
{2=2
{4=4
(x;y) = (2;2)
2. 6m2n-3m2+2mn-m
m(6mn-3m+2n+1)
m(3m(2n-1)+2n-1)
m(2n-1)(3m+1)
3. (2x-1)(2x+1)=2(x-3)2+x(2x-3)
4x2-1=2(x2-6x+9)+2x2-3x
4x2-1=2x2-12x+18+2x2-3
4x2-1=4x2-15x+18
-1x=-15x+18
15x=18+1
15x=19
x=19/15
Б) 4^x-11=1/16
4^x-11=4^-2
x-11=-2
x=9
a) log3(7x-15)=3
log3(7x-15)=log3(27)
7x-15=27
7x=42
x=6
в) √13 - x = 3
x = √13 - 3
а) 9,4*10^3 + 2,2*10^2 = 9400+220 = 9620
б) 3^-4 * 3^3 : 3^-3 = 3^-4+3+3 = 3^2 = 9
в) log2(0,5) + log2(8) = -1 + 2 = 1
г) cos30° - ctg30° - sin30° = √3/2 - √3 - 1/2 = ( √3 - 2√3 -1)/2 = - ( √3+1)/2
Y=2*3.5-15
y=7-15
y=-8
нет корней
<span>10-7х=3-2(5х+1)
10-7x = 3-10x-2
-7x+10x= 3-2-10
3x= -9
x= -3
Ответ: -3</span>
Tg5π/6·cos7π/4<0
tg5π/4<0;cos7π/4>0;