Question

5, Tính tổng :

a) ( -125)+100+80+125+20

b) 27+55+(-17)+(-55)

c) (-92)+(-251)+(-8)+251

d) (-31)+(-95)+131+(-5)

MAI MK PHẢI NỘP GẤP , GIÚP MK NHÉ CÁC BẠN.

Answer 1

a) (-125)+100+80+125+ 20=[(-125)+125]+100+(80+20)

=0+100+100=200

b)27+55+(-17)+(-55)=[27+(-17)]+[55+(-55)]

=10+0=10

c)(-92)+(-251)+(-8)+251=[(-92)+(-8)]+[(-251)+251]

=(-100)+0=-100

d)(-31)+(-95)+131+(-5)=[(-31)+131]+[(-95)+(-5)]

=100+(-100)=0

Answer 2

a) ( -125)+100+80+125+20

= [(-125) + 125] + (80+20) +100

= 0 + 100+100

=200

b) 27+55+(-17)+(-55)

= [27+(-17)]+[55+(-55)]

= 10+0

=10

c) (-92)+(-251)+(-8)+251

=[(-251)+251]+[(-92)+(-8)]

=0+(-100)

=-100

d) (-31)+(-95)+131+(-5)

=[(-31)+131]+[(-95)+(-5)]

=100+(-100)

=0

Answer 3

a) ( -125 ) + 100 + 80 + 125 + 20

= ( -125 + 125 ) + 100 + ( 80 + 20 )

= 0 + 100 + 100

= 200

b) 27 + 55 + ( -17 ) + ( -55 )

= ( -55 + 55 ) + [ 27 + ( -17 ) ]

= 0 + 10

= 10

c) ( -92 ) + ( -251 ) + ( -8 ) + 251

= ( -251 + 251 ) + [ ( -92 ) + ( -8 ) ]

= 0 + ( -100 )

= -100

d) ( -31 ) + ( -95 ) + 131 + ( -5 )

= [ 131 + ( -31 ) ] + [ ( -95 ) + ( -5 ) ]

= 100 + ( -100 )

= 0