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Afla produsul numerelor a,b,c stiind ca a+b=28, b+c=32, a+c=30?


Răspuns :

a+b=28
b+c=32
a+c=30
______(+)
2a+2b+2c=90
2(a+b+c)=90
a+b+c=45
28+c=45=> c=17
b+17=32=>b=15
a+b=28=>a=13
a*b*c=17*15*13=3315

28+32+30=60+30=90
90:2 = 45 (a+b+c )
45-28=17(c)
32-17=15(b)
28-15=13(a)