a) -I-5I +(-19) +18 + I11-4I -57
b) (-3)+I-8I+(-7)+12
Tính tổng
e) 371 + 731 – 271 – 531 =
f) 57 + 58 + 59 + 60 + 61 – 17 – 18 – 19 – 20 – 21 =
g) 9 – 10 + 11 – 12 +13 – 14 + 15 – 16 =
Thực hiện phép tính:
a) 371 + 731 - 271 - 531
b) 57 + 58 + 59 + 60 +61 - 17 - 18 -19 -20 -21
c) 9 - 10 + 11 - 12 + 13 - 14 + 15 - 16
a 12 – 34 b 23 – 47 c 31 – 23 d 9 – 5 e 4 – 15 25 f 23 13 17 57 g 4 . 9 6 . 12 – 7 h 14 6 19 14 19 i 56 – 8. 27 7 j 8 5 . 2 – 3 6 k 4 . 3 125 . 25 8 l 9 6 . 3 – 4 7 m 45. 18 – 15 – 18. 45 – 15
-/5/+(-19)+18+/11-4/+(-57)
-l-5l+(-19)+18+l11-4l-57
- I - 5 I + ( -19 ) + 18 + I 11 - 4 I - 57
a, -|-5| + ( - 19 ) + 18 + | 11 - 4 | - 57
a) 30-[35-(-12-18)]
b) -321-[(-57)+(-321)-(-19)