Question

sa se afle valoarea numerelor a,b,c,stiind ca a+b=30,a+c=40,b+c=50.

Answer 1

2 (a+b+c)=30+40+50
a+b+c=120÷2
a+b+c=60
30+c=60 c=60-30=30
a+50=60 a=60-50=10
a+b=30 10+b=30 b=30-10=20
10+20+30=60

Answer 2

a+b=30, +
a+c=40,
b+c=50.
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2a+2b+2c=30+40+50
2×(a+b+c)=120
a+b+c=120 : 2
a+b+c=60

a+b+c=60; a+b=30
30+c=60
c=60-30
c=30

b+c=50.
b=50-30
b=20

a+c=40,
a=40-30
a=10