Question

Tính hợp lý:

a) 815 - 23 - 77 + 185

b) 3145 - 246 + 2347 - 145 + 4246 - 347

c) 2018 : 1 - 2018 . 1 : 2018 . 2008 + 2018 . 2002

d) 9 - 8 - 7 - . . . - 2 - 1 . ( 500 . 9 - 250 . 18 )

Answer 1