\(\left(27+55\right)+\left(345-27-55\right)\)

\(=27+55+345-27-55\)

\(=\left(27-27\right)+\left(55-55\right)+345\)

\(=0+0+345\)

\(=345\)

\(38.65+38.50-38.15\)

\(=38.\left(65+50-15\right)\)

\(=38.100\)

\(=3800\)

\(\left(123-60\right)-\left(2017-60+123\right)\)

\(=123-60-2017+60-123\)

\(=\left(123-123\right)-\left(60-60\right)-2017\)

\(=0-0-2017\)

\(=-2017\)

Bỏ dấu ngoặc rồi tính:

(27 + 55 ) + ( 345 - 27 - 55 )

= 27 + 55 + 345 - 27 - 55

= (27-27) + (55-55) + 345

= 0 + 0 + 345

= 345

Tính nhanh:

38.65 + 38.50 - 38.15

= 38.(65+50-15)

= 38.100

= 3800

Bỏ ngoặc rồi tính:

( 123 - 60 ) - ( 2017 - 60 + 123 )

= 123 - 60 - 2017 + 60 - 123

= (123-123) + (60-60) - 2017

= 0 + 0 - 2017

= 0 - 2017

= -2017

38.65+38.50-38.15

=38.(65+50-15)

=38.100

=3800

   10 - [ 12 - ( -9 - 1 ) ]

= 10 - 12 - 9 - 1

= -2 - 9 - 1

=   -11 -1

=     -12

10-(12-(-9-1))=10-(12--10)=10-22=-12

10-[12-(-9-1)]

=10-(12+9+1)

=10-12-9-1

=-12

\(-144-\left[29-\left(+144\right)-\left(+144\right)\right]\)

\(=-144-29+144+144\)

\(=\left(144-144\right)+\left(144-29\right)\)

=0+115

=115

-144 - [29 - (+144) - (+144)]

= -144 - (29 - 144 + 144)

= -144 - 29 + 144 - 144

= (-144 - 29) + (144 - 144)

= -173 + 0

= -173

232 - (230 + 232 - 350)

=232 - (-230) - 232 + 350

=462 - 232 + 350

=230 + 350

=580

=232-230-232+350

=232-(230+350)

=232-580

=-348

=)

 = 232 - (-230) - 232 +350

=[( -230) +350 ] - ( 232-232)

= 120  -  0

= 120

\(\left(-243+345\right)-\left[257+\left(-55\right)-129\right]\)

\(=-243+345-257+55+129\)

=-500+400+129

=129-100

=29

\((-243+345)-[257+(-55)-129]\\=-243+345-257+55+129\\=(-243-257)+(345+55)+129\\=-(243+257)+400+129\\=-500+400+129\\=-100+129\\=29\)

ê bài này làm như nào3 + 3 mũ 1 + 3 mũ 2 + 3 mũ 3 + 3 chấm +3 mũ 9 + 3 mũ 10

271 - [(-43) + 271 - (-17)]

= 271 - [ 228 + 17 ]

= 271 - 245

= 26

-144 - [29 - 144 - 144]

= -144 - 29 + 144 + 144

= (-144 + 144) + (-29 + 144)

= -29 + 144 = 115 

đề là : -144-[29-(+144)-(+144)]

fai ko
 

\(-144-\left(29-\left(+144\right)-\left(+144\right)\right)=-144-\left(29-144-144\right)=-144-29+144+144=115\)

 271-[(-43)+271-(-17)]

=271+43-271-17

= (271+-271)+(43-17)

=0+26

=26

271-[(-43)+271-(-17)]

=(271-271)+43-17

=0+26

=26 ( cách làm có thể sai nhưng kết quả đúng 100%)

271 - [-43 + 271 - (-17)]

= 271 - [-43 + 271 + 17]

= 271 + 43 - 271 - 17

= (271 - 271) + (43 - 17)

= 43 - 17 = 26

=-329-15+101-25+440

=-344 + 101-25+440

=-243-25+440

=-268+440

=172

-329 -(15-101)-(25-440)

= -329 -15 + 101 -25+440

= 172