Question

Cuanto es 40+12-45+67-12+89+100-1000=

Answer 1

$40+12-45+67-12+89+100-1000= \\ \\ (40+12+67+89+100) - (45+12+1000)= \\ \\ (308) - (1057)= \boxed{- 749}$

Espero que te sirva, salu2!!!!

Answer 2

40 + 12 - 45 + 67 - 12 + 89 + 100 - 1000

52 - 45 + 67 - 12 + 89 + 100 - 1000

7 + 67 - 12 + 89 + 100 - 1000

74 - 12 + 89 + 100 - 1000

62 + 89 + 100 - 1000

151 + 100 - 1000

251 - 1000

= -749