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(8X9+S-5X8)-(30-5X2+5)=100:2:2

Răspuns :

(72+S-40)-(30-10+5)=25
32+S-25=25
32+S=50
S=18
(8X9+S-5X8)-(30-5X2+5)=100:2:2
(72+S-40)-(30-10+5)=25
(32+S)-25=25
(32+S)=25+25
32+S=50
S=50-32
S=18