Question

urgent..............
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Answer 1

Răspuns:

Explicație pas cu pas:

3)  

a + b = 69

a : b = 7 rest 5  <=>

a = 7b + 5 =>

7b+5+b = 69 <=>

8b + 5 = 69 =>

8b = 69-5 = 64 =>

b = 64:8 => b = 8

a = 7·8+5 = 56+5 => a = 61

Verificare: 61+8 = 69

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4)

a - b = 161

a : b = 19 rest 17 <=>

a = 19b + 17 =>

19b+17-b = 161 =>

18b = 161-17 = 144 =>

b = 144:18 => b = 8

a = 19·8+17 = 152+17 => a = 169

Verificare : 169-8 = 161