1)7^9:(2х-1)7^7
7^9:(2х-1)=7^7, x≠1/2
7^9/2x-1=7^7
7^9=7^7*(2x-1)
7^2=2x-1
49=2x-1
-2x=-1-49
-2x=-50
x=25, x≠1/2
x=25
2)3^11*(0,1x1,4)=3^13
0,1x-1,4=3^2
0,1x-1,4=9
0,1x=9+1,4
0,1x=10,4
x=104
3)11^4*(43-2x)=11^6
43-2x=11^2
43-2x=121
-2x=121-43
-2x=78
x=-39
4)4^12:(10x-8,3)=4^10
4^12:(10x-8,3)=4^10, x≠0,83
4^12:(10x-83/10)=4^10
4^12:100-83/(десять будет внизу)10=4^10
4^12*10/100x-83=4^10
10*4^12/100x-83=4^10
10*4^12=4^10*(100x-83)
10*4^2=100x-83
10*16=100x-83
160=100x-83
-100x=-83-160
-100x=-243
x=243/100, x≠0,83
x=243/100, x≠83/100
x=243/100