Răspuns :
a + m = 120
2a + 5m = 390
3m = 390 - 120 x 2
3m = 150
m = 150/3
m = 50 ----> a = 120-50
a = 70
2a + 5m = 390
3m = 390 - 120 x 2
3m = 150
m = 150/3
m = 50 ----> a = 120-50
a = 70
a+m=120
2a+5m=390
a+m=120 lx2(amplificam cu 2)
2a+5m=390
2a+2m=240 (de la amplificare)
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= 3m=390-240=150
m=150:3
m=50
a+m=120
a+50=120
a=120-50
a=70
Proba
ax2+mx5=390
70x2+50x5
140+250=390
2a+5m=390
a+m=120 lx2(amplificam cu 2)
2a+5m=390
2a+2m=240 (de la amplificare)
__________________
= 3m=390-240=150
m=150:3
m=50
a+m=120
a+50=120
a=120-50
a=70
Proba
ax2+mx5=390
70x2+50x5
140+250=390