5х+8+12-2х=1-6х+9
5х-2х+6х=9+1-8-12
9х=-10
10
х=- --- .
9
1. log(3; 27)=3
3^x=27
x=27
2. log(4; 1)=0
4^x=1
x=0
3. log(1/2; 4)=-2
(1/2)^x=4
x=-2
4. 6log(6; 13)=6*ln13/ln6=(6*ln13)/(ln2+ln3)
1) -4,8 : 4/15 = -48/10 * 15/4 = -18
2) 15 3/7 - (-18) = 15 3/7 + 17 7/7 = 32 10/7 = 33 3/7
3) 2 1/3 * 33 3/7 = 7/3 * 234/7 = 78
4) -2 2/3 + 78 = -2 2/3 + 77 3/3 = 75 1/3
Смотри фото....это изи....