Răspuns:
Explicație pas cu pas:
2 × ( 20 : 2 + 3 ) = ( 8 + 5 ) × ( 4 : 2 )
2 × ( 10 + 3 ) = 13 × 2
2 × 13 = 26
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( 14 : 7 + 20 ) : 2 = ( 5 + 6 ) × 2 - 11
( 2 + 20 ) : 2 = 11 × 2 - 11
22 : 2 = 22 - 11
11 = 11
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