Question

Tìm số nguyên x , biết : 

 a/ -19 + ( 13 - x ) = -2

b/ 11 + x - 2⁴ = 21

Answer 1

a, -19 + (13 - x) = -2

13 - x = -2 - 19

13 - x = -21

=> x = 13 - (-21)

=> x = 33

b, 11 + x - 2⁴ = 21

x - 2⁴ = 21 - 11

x - 16 = 10

=> x = 10 + 16

=> x = 26

Answer 2

a. -19 + (13-x) = -2

=> -19 + 13 - x = -2

=> -6 - x = -2

=> x = -6 - (-2)

=> x = -6+2

Vậy x=-4.

b. 11+x-2⁴=21

=> 11+x-16=21

=> x-5=21

=> x=21+5

Vậy x=26.