Question

1.Thực hiện phép tính

a) ( 42 - 69 + 17 ) - (42 +17 )

b) 99 + (-100) +101 

c) (-2013) - (57-2013)

d) ( 1992 + | -124 | ) - ( 1992 -106)

2.Tìm x biết :

6 chia hết cho (x-1) 

Answer 1

1, a) ( 42 - 69 + 17 ) - ( 42 + 17 )

= 42 - 69 + 17 - 42 - 17

= - 69

Answer 2

b) 99 + ( -100 ) + 101

= 99 - 100 + 101 

= 100

Answer 3

c) (-2013) - ( 57 - 2013 )

= -2013 - 57 + 2013

=-57

Answer 4

d) ( 1992 + |-124| ) - ( 1992 - 106 )

= 1992 + 124 - 1992 + 106 

230

Answer 5

Bài 2:

 Vì \(6⋮\left(x-1\right)\)

\(\Rightarrow\left(x-1\right)\in\left\{-6;-3;-2;-1;1;2;3;6\right\}\)

\(\Rightarrow x\in\left\{-5;-2;-1;0;2;3;4;7\right\}\)