Question

已知2a-3b-4c=4,求4^a/8^b*（1/16）^c-4的值

输错了，是已知2a-3b-4c=4，求4的a次方除以8的b次方乘（1/16）的c次方-4的值

Answer 1

4^a/8^b*（1/16）^c-4
=2^2a / 2^3b * (2^-4)^c-4
=2^(2a-3b)*2^(-4c)-4
=2^(2a-3b-4c)-4
=2^4-4
=16-4
=12

Answer 2

4^a/8^b*（1/16）^c-4
=2^(2a-3b-4c)-4
=2^4-4
=16-4
=12

Answer 3

4^a/8^b*（1/16）^c-4
=2^2a / 2^3b * (2^-4)^c-4
=2^(2a-3b)*2^(-4c)-4
=2^(2a-3b-4c)-4
=2^4-4
=16-4
=12