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a fost răspuns

(8•9+S-5•8)-(30-5•2+5)=100:2:2

Răspuns :

(71+S-40)-(30-10+5)=50:2

(71+S-40)-(20+5)=25

(71+S-40)-15=25

(71+S-40)=25+15

(71+S-40)=40

71+S-40=40

71+S=40+40

71+S=80

S=80-71

S=9
( 8 × 9 + S - 5 × 8 ) - ( 30 - 5 × 2 + 5 ) = 100 : 2 : 2

( 72 + S - 40 ) - ( 30 - 10 + 5 ) = 50 : 2

( 72 + S - 40 ) - ( 20 + 5 ) = 25

( 72 + S - 40 ) - 25 = 25

72 + S - 40 = 25 + 25

72 + S - 40 = 50

72 + S = 50 + 40

72 + S = 90

S = 90 - 72

S = 18

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