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Va rog ajutati-ma la pb 17

Va Rog Ajutatima La Pb 17 class=

Răspuns :

a=4b
c=b-4
a+b+c=100
4b+b+b-4=100
6b=104
b=17,(3)
a=69,(3)
c=13,(3)
17.

a : b = 4 => a = 4 × b

b - c = 4 => c = b - 4

a + b + c = 100

4 × b + b + b - 4 = 100

6 × b - 4 = 100

6 × b = 100 + 4

6 × b = 104

b = 104 : 6

b = 17, ( 3 )

a = 4 × 17, ( 3 )

a = 69 , ( 3 )

c = 17, ( 3 ) - 4

c = 13, ( 3 )