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ex 31 daca stiti va rog

Ex 31 Daca Stiti Va Rog class=

Răspuns :

a / (1/12) = b / (1/15) ==> 12 × a = 15 × b (1 )

a = b × P/100

12 × a = 12bP / 100 (2)

din relatiile ( 1 ) si ( 2 ) ==>

==> 12bP / 100 = 15b

==> P = 15 × 100 / 12

==> P = 5 × 100 / 4

==> P = 5 × 25

==> P = 125 (procente)
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