Question

am nevoie urgentă!!!!!!!!!!​

Answer 1

a=2¹⁹⁹⁰-2¹⁹⁸⁹-2¹⁹⁸⁸

a=2¹⁹⁸⁸×(2²-2-1)

a=2¹⁹⁸⁸×(4-2-1)

a=2¹⁹⁸⁸×1

a=2¹⁹⁸⁸

a/x=4⁹⁹³/0,25

2¹⁹⁸⁸/x=(2²)⁹⁹³/0,25

2¹⁹⁸⁸/x=2¹⁹⁸⁶/0,25

x=(2¹⁹⁸⁸×0,25)/2¹⁹⁸⁶

x=2²×0,25

x=4×0,25

x=1

Answer 2

Răspuns:

Explicație pas cu pas:

a = 2^1990 - 2^1989 - 2^1988 = 2^1988*(4 - 2 - 1) = 2^1988

0,25 = 25/100 = 1/4

4^993/(1/4) = 4*4^993 = 4^994 = (2^2)^994 = 2^1988

a/x = 2^1988

x = a/2^1988 = 2^1988/2^1988 = 1