Răspuns:
Explicație pas cu pas:
a) A={1; 2; 4; 8; 16}, B={2^0; 2^1; 2^2; 2^4}, A = B
b) A={8; 9; 19;...39}, 8<= y < 40, B={8; 9; 19;...39}, A=B
c) 10^20x : 10^28x = 10^2x
10^2x = 10^4, x = 2, A={2}
x(1+2+3+...+10) =110
x*11*10/2 = 100, 110*x = 2*110, x=2, B={2}, A=B
