( 18 + 29 ) + ( 158 − 18 − 29 ) = 18 + 29 + 158 − 18 − 29 = ( 18 − 18 ) + ( 29 − 29 ) + 158 = 0 + 0 + 158 = 158.

900

158

\(\text{-87+(-12)-(-487)+512}\\ =\left(-87-\left(-487\right)\right)+\left(-12\right)+512\\ =400+500\\ =900\)

Bài 1:

= - 87 - 12 + 487 + 512

= ( 487 - 87 ) + ( 512 - 12 )

= 400 + 500 = 900

Bài 2:

= 18 + 29 + 158 - 18  - 29

= ( 18 - 18 ) + ( 29 - 29 ) + 158

= 158

(18 + 29) + (158 – 18 – 29) = 18 + 29 + 158 -18 – 29

= (18 – 18) + (29 – 29) + 158 = 0 + 0 + 158 = 158

đung roi

18+29+158-18-29

=(18-18)+(29-29)+

=158

@kien đúng rùi

(18+29)+(158-18-19)

=47+121

=168

(13-135+49)-(13+49)

= -73-62

=-135

(18+29) +( 158 -18-29)

= 18 + 29 + 158 - 18 - 29

= 18 - 18 + 29 - 29 + 158

= 0 + 0 + 158

= 158

(13-135+49)-(13+49)

= 13 - 135 + 49 - 13 - 49 

= 13 - 13 + 49 - 49 - 135

= 0 + 0 -135

= -135

( 18 + 29 ) + ( 158 - 18 - 29 )

= 18 + 29 + 158 - 18 - 29

= ( 18 - 18 ) + ( 29 - 29 ) + 158

= 0 + 0 + 158

= 158

( 13 - 135 + 49 ) - ( 13 + 49 )

= 13 - 135 + 49 - 13 - 49

= ( 13 - 13 ) + ( 49 - 49 ) - 135

= 0 + 0  - 135

= -135

( 18 + 29 ) + ( 158 - 18 - 28 )

= 18 + 29 + 158 - 18 - 29 

= [18 + ( -18 ) ] + [ 29 - 29 ] + 158

= 0 + 0 + 158 

= 158 

Câu cuối cùng bn tự làm nha! 

= - 74

-74

\(-74\)

a) 18 + 29 - 158 - 29 - 18 = -158

b) 13 - 135 + 49 - 13 - 49 = -136

tick nha

a) =18+29+158-29-18=18-18+29-29+158=0+0+158=158

b) =13-135+49-13-49=13-13+49-49-135=0+0-135=-135

Tick nha

a) 18 +29 + 158 - 18 - 29
b) 13-135+49+13-49
rồi tính đi

tick mik nha