Question

Quanto é 20-{-10+[+20-(-20+10)]} ?

Answer 1

$<var>20-{-10+[+20-(-20+10)]}$

$20-{-10+[+20-(-10)]}$

$20-{-10+[+20+10]}$

$20-{-10+[+30]}$

$20-{-10+30}$

$20-{+20}$

$20-20 = 0</var>$

Answer 2

 

 

20-{-10+[+20-(-20+10)]}

20-{-10+[+20+10]}

 

20-{-10+30}

 

20-20

 

0

 

e fui