12^5-18^4=6^5*2^5-6^4*3^4=6^4*3*(2^6-3^3)=6^4*3*(64-27)=6^4*3*37
-2x*3²+4*5³
-18х+500
-18х=-500
х=27 7/9
Ответ:
x=-1
Объяснение:
2^(4-5x) = 512
2^4 * 2^(-5x) = 512
16 * 2^(-5x) = 512
2^(-5x) = 512/16
2^(-5x) = 32
2^(-5x) = 2^5
-5x = 5
x = -1