Question

determitați numerele a, b, c, știind ca a+b=100 b+c=110 a+c=90

Answer 1

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Answer 2

a + b      = 100

     b + c = 110

a    +    c =  90

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2 × a + 2 × b + 2 × c = 100 + 110 + 90

2 × ( a + b + c ) = 300

a + b + c = 300 : 2

a + b + c = 150 → suma celor trei numere

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150 - 110 = 40 ( a )

100 - 40 = 60 ( b )

110 - 60 = 50 ( c )

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