Question

Tính hợp lý
a, -329+ (27-111) - ( 127-440)

b, (157 - 984) - ( 16-74 ) - ( 374 - 243)

Answer 1

a) -329 + ( 27 - 111 ) - ( 127 - 440 )

= -329 + 27 - 111 - 127 + 440

= -329-111 -127 + 27 +440

= -440 - 100 +440

=-100

b) ( 157 - 984 ) - ( 16 - 74 ) - ( 374 - 243 )

= 157 - 984 - 16 +74 - 374 + 243

= 157 + 243 - 984 - 16 -374 + 74 

= 400 - 1000 - 300

= 100 - 1000

= -900

Answer 2

a) -329 +(27-111)-(127-440)

=-329+(-84)-(-313)

=-414-(-313)

=-100

Answer 3

(157-984)-(16-74)-(374-243)

=(-827)-(-58)-131

=-769-131

=-900

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