Question

[Vũ Hạ]

Thuc hien phep tinh

a) ( -5 ) + ( -9 ) + ( -12)

b) ( -8 ) + ( - 13 ) + ( -54 ) + ( -67 )

c) 12 + 38 - 30 - 22

d) 34 + ( -43 ) + 66 - 57

Answer 1

[Nguyễn Nguyệt Minh]

a)-26

b)-142

c)-2

d)0

Answer 2

[Nguyễn Lê Phước Thịnh]

a) Ta có: (-5)+(-9)+(-12)

=-(5+9+12)

=-26

b) Ta có: (-8)+(-13)+(-54)+(-67)

=(-8-54)+(-13-67)

=-62-80

=-142

c) Ta có: 12+38-30-22

=(12-22)+(38-30)

=-10+8

=-2

d) Ta có: 34+(-43)+66-57

=(34+66)-(43+57)

=100-100

=0