Question

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Incaz ca nu intelegeti:

"5.Sa se alfe numerele a,b si c, stiind ca a+b=3 000,b+c=5 000,iar a+c=4 000."
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Answer 1

Răspuns:

c=3000

a=1000

b=2000

Explicație pas cu pas:

a+b=3000

b+c=5000

a+c=4000

2×a + 2×b + 2×c=3000+5000+4000

2×a + 2×b + 2×c=12000

2×(a+b+c)=12000

a+b+c=12000÷2

a+b+c=6000

a+b=6000-c

6000-c=3000

c = 6000-3000

b+c=6000-a

6000-a=5000

a =6000-5000

a+c=6000-b

6000-b=4000

b = 6000-4000

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