Question

[Gaikhoivienqa]

1-3+2-4+3-6+..+20-23

Answer 1

[๖²⁴ʱMonღThành♪(ʚŤєαмℓσʋεσℓмɞ)‏]

1 - 3 +2 - 4 + .... + 20 - 23

= -2 -2 - 2 -... - 2 (có 12 nhóm)

= -2. 12 = -24

Answer 2

[Mai Hà My]

1-3 + 2-4 + 3-6 + ... + 20-23

= (1-3) + (2-4) + (3-6) + ... + (20-23) (có 12 nhóm)

= -2.12

= -24