te rog! urgent!dau coroană! ex 13 ;14

Răspuns:
sall
Explicație pas cu pas:
r45+r20-r80=r15
r18-r8-r2+r50=r58
2r5+7r5+r180-17r5=2r5+7r5+6r5-17r5=-2r5
2r500-3r125+7r45-5r5=1r415