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Află numarul necunoscut 500-(25 × 3 + 13 × 3) : a = 481

Răspuns :

500 - ( 25 × 3 + 13 × 3 ) : a = 481

500 - ( 75 + 39 ) : a = 481

500 - 114 : a = 481

114 : a = 500 - 481

114 : a = 19

a = 114 : 19

a = 6

Verificare :

500 - ( 25 × 3 + 13 × 3 ) : 6 =

500 - ( 75 + 39 ) : 6 =

500 - 114 : 6 =

500 - 19 = 481

Răspuns

500-(75+39):a=481

500-114:a=481

-114:a=481-500

-114:a=-19 ·(-1)

a=114:19

a=6