4 задание , плиз !!! Или 2
2 Ответ (-а, -ов)
2^(12x-1)-2^(12x-2)+2^(12x-3)-2^(12x-4)=640
2^(12x-4)*(8-4+2-1)=640
5*2^(12x-1)=640
2^(12x-4)=640:5
2^(12x-4)=128
12x-4=7
12x=11
x=11/12
2^(12x-4)*(8-4+2-1)=640
5*2^(12x-1)=640
2^(12x-4)=640:5
2^(12x-4)=128
12x-4=7
12x=11
x=11/12