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a fost răspuns

Afla numarul necunoscut 3*[3+4*(15+5*m):9]=69

Răspuns :

3×[3+4×(15+5×m):9]=69
3×[3+4×(15+5m):9]=69
3+4×(15+5m):9=69:3
3+(60+20m):9=23
(60+20m):9=23-3
(60+20m):9=20
60+20m=20×9
60+20m=180
20m=180-60
20m=120
m=120:20
m=6

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