Question

Repede!Cei cu matematica haai!Ex din poza!!!

Answer 1

16. a)  x + ( - 2 + 3 - 5 ) - ( - 7 + 4 - 1 + x ) =
= x + ( - 4 ) - ( - 7 + 4 - 1 + x ) =
= x + ( - 4 ) - ( - 4 + x ) =
= x - 4 + 4 - x = 0

b) - x + ( - 4 + 7 - 3 ) - ( - 2 - x + 4 - 3 ) =
= - x + 0 - ( - 1 - x ) =
= - x + 1 + x = 1

c) - 7 - ( x + 14 ) - ( 273 - 9 + 381 ) - ( - 645 - x - 20 ) =
= - 7 - x - 14 - 645 - ( - 655 - x ) =
= - 7 - x - 14 - 645 + 665 + x = -1

d) 17 + ( x - 4 ) - ( - 7 + 5 + x ) + ( - 2 + 14 ) - ( - 4 + 30 ) =
= 17 + x - 4 - ( - 2 + x ) + 12 - 26 =
= 17 + x - 4 + 2 - x + 12 - 26 = 
= 17 - 4 + 2 + 12 - 26 = 1