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Pb. 10. Urgent! dau coroana

Pb 10 Urgent Dau Coroana class=

Răspuns :

a = 120, b = 90, c = x ,d = 2x/3
120+90+x+2x/3=360
5x = 1080 - 630
5x = 450
x = 90
d = 60
c = 90