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a fost răspuns

x-y=12 si z=10,calculati xz-yz
ab+ac=420 si b+c=14,aflati a
ab-ac=135 si a=9 aflati b-c

Răspuns :

Agretta
xz-yz=
z(x-y)=10·12=120

ab+ac=420,b+c=14 
a(b+c)=a·14=420,a=30

ab-ac=135,a=9
a(b-c)=9·(b-c)=135
b-c=135:9,b-c=15


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