Решите уравнение: 2^(x+2)-2^x+2^(x+1)=20
2^x*4 - 2^x + 2^x*2 = 20 2^x( 4 - 1 + 2) = 20 2^x *5 = 20 2^x = 4 2^x = 2^2 ==> x = 2