Question

1/ Tính hợp lí :

a/ 259 . 13 + 259 . 86 + 259

b/ 1 – 2 – 3 + 4 + 5 – 6 – 7 + 8 + ... + 101 – 102 – 103 + 104

Answer 1

a) \(259.\left(13+86+1\right)=259.100=25900\)

Answer 2

a/ 259 . 13 + 259 . 86 + 259

= 259 . 13 + 259 . 86 + 259 . 1

= 259 . ( 13 + 86 + 1 )

= 259 . 100

= 25 900