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a+b+c+d=520 a+b+c=360 b+c+d=420 a+c+d=400

Răspuns :

a+b+c+d=520
b=520-400=120
d=520-360=160
a=520-420=100
c=520-380=140
d+b+a=380

Bianca330
d=520-360=160
a=520-420=100
b=520-400=120
c=520-(100+160+120)=520-380=)140
P=160+100+120+140=520