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

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

a) Bỏ ngoặc ta có biểu thức sau :

18 + 29 + 158 - 29 - 18 

= ( 18 - 18 ) + ( 29 - 29 ) + 158 

= 0 + 0 + 158

= 158

b) Bỏ dấu ngoặc ta có biểu thức sau :

13 - 135 + 49 - 13 + 49

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

= 0 + 135 + 0 

= 135

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

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

tick nha bạn

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

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

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

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

    Mình không chắc lắm nhưng mình chỉ làm theo ý mình thôi , nếu đúng bạn cứ sử dụng nếu sai thì thôi coi như bạn góp ý 

( 18+29 ) + ( 158-28-18) 

=18+29+158-28-18

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

=29+0+130=159

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

=13-135+49-13-49

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

=0+0+(-135)

=-135

a) 18 + 29 +158 - 29 - 18

=  158

b) 13 - 135 +49 - 13 +49

=  -37

\(a)(18+29)+(158-29-18)\)

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

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

\(=0+0+158=158\)

\(b)(13-135+49)-(13+49)\)

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

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

\(=0+0-135=-135\)

a) ( 18 + 29 ) + ( 158 - 29 - 18 ) 

= 18 + 29 + 158 - 29 - 18

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

= 0 + 0 + 158

= 158.

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

= 13 - 135 + 49 - 13 + 49

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

= 0 + 0 + 135

= 135

a, (18+29) +(158-18-29)

= 18+29+158-18-29

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

= 158

b, (13-135+49)- (13+49)

= 13-135+49-13-49

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

= 135

a, \(\left(18+29\right)+\left(158-18-29\right)\)

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

\(=\left(18-18\right)+\left(29-29\right)+158\)

\(=158\)

b,

\(\left(13-135+49\right)-\left(13+49\right)\)

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

= \(\left(13-13\right)+\left(49-49\right)-135\)

= \(-135\)

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

=18-29+185-18-29

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

=0+0-158

=-158

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

=13-135+49-13-49

=(13-13)+(49-49)-153

=0+0-153

=-153

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

=13+49-13+135-49

=13-13+49-49+135

=0+0+135

=135

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

=18+29+158-18-29

=18-18+29-29+158

=0+0+158

=158

c)4 .5²-3 .(24-9)

=4. 5²- (3.24-3.9)

=4. 5²-3.24+3.9

=4.25-72+27

=100-72+27

=28+27

=55

d)[93-(20-7)]:16

=(93-20+7):16

=80:16

=5

chúc cậu hok tốt

a) (13 + 49) - (13 - 135 + 49)

= 13 + 49 - 13 + 135 - 49

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

= 0 + 0 + 135

= 135

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

= 18 + 29 + 158 - 18 - 29

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

= 0 + 0 + 158

= 158

c) 4.5² -3.(24 - 9)

= 4.25 - 3.15

= 100 - 45

= 55

d) [93 - (20 - 7)] : 16

= [93 - 13] : 16

= 80 : 16

= 5

a,\((13+49)-(13-135+49)\)

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

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

\(=0+0+135\)

\(=135\)

\(b,(18+29)+(158-18-29)\)

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

\(=(18-18)+(29-29)+158=0+0+158=158\)

c,Tự làm

d,\([93-(20-7)]:16\)

\(=(93-13):16=\frac{80}{16}=5\)