= - 69 bn nha

tk cho mk đi

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

=44-69+17+42+17

=(42-42)-(17-17)-69

=0-0-69

=-69

ai k mình mình k lại

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

=42-69+17-42-17

=(42-42)+(17-17)+69

=0+0+69

=69

nhầm = -69

\(\left(42-69+17\right)-\left(42+17\right)=42-69+17-42-17=-69\)

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

=44-69+17+42+17

=(42-42)-(17-17)-69

=0-0-69

=-69

               Ai k mình mình k lại

a)=27+65+346-27-65

=(27-27)+(65-65)+346

=0+0+346

=346

b)=42+69-17-42+17-35

=(42-42)+(17-17)+(69-35)

=0+0+34

=34

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

= 42 - 69 + 17 - 42 - 17

= - 69

b) 99 + ( -100 ) + 101

= 99 - 100 + 101 

= 100

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

= -2013 - 57 + 2013

=-57

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

=42-69+17-42-17

=42+(-69)+17+(-42)+(-17)

=[42+(-42)]+[17+(-17)]+(-69)

=0+0+(-69)

=(-69)

(42 – 69 + 17) – (42 + 17)

= 42 – 69 + 17 – 42 – 17 (bỏ dấu ngoặc có dấu – đằng trước)

= 42 – 42 + 17 – 17 – 69

= 0 + 0 – 69 = –69.

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

= 42-69 +17- 42-17

=-69

đap số -69

= 42-69+17-42-17

= -27+17-42-17

= -10-42-17

= -52-17

= -69

= 42 - 69 + 17 - 42 + 17

= ( 42 - 42 ) - ( 17 - 17 ) - 69

= 0 - 0 - 69

= ( - 69 )

a)

42+69+158=(42+158)+69=200+69=269

(42-69+17 -2) - ( 42 -69 +19 - 2)

=(42 -69 +17 -2) - ( 42 -69 +17 +2-2)

=(42 -69+17 -2) - (42 - 69 +17-2 ) -2 

=-2