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20+{2×[(2+12+22):2+2]-2}-18=40

Răspuns :

20 + { 2 × [ ( 2 + 12 + 22 ) : 2 + 2 ] - 2 } - 18 = 40 ( Adevarat) 
= 20 + [ 2 
× ( 36 : 2 + 2 ) - 2 ] - 18 = 
= 20 + ( 2 × 20 - 2 ) - 18 = 
= 20 + 38 - 18 =
= 58 - 18 =
= 40  

20 + {2 × [(2 + 12 + 22) : 2 + 2] - 2} - 18 = 

= 20 + [2 
× (36 : 2 + 2) - 2] - 18  

= 20 + (2 × 20 - 2) - 18 

= 20 + 38 - 18 

= 58 - 18 

= 40