Răspuns :

AlbertImid

Salutare din nou !

1 ora = 60 min

Deci..... 1/2 x60 = 60/2 = 30 min

1 min = 60 sec => 30 x 60 = 1800 sec ( in 30 min)

1 1/2 = 1 x 2 +1 = 3/2

3/2 x 60=  180/2  = 90 min

90 min = 30 min x 3 => 1800+1800+1800 = 5400 sec

Succes !

#AlbertGaming

Atlarsergiu18791id

1.

[tex] \frac{1}{2} ore = ...... \: secunde[/tex]

1 oră = 3600 secunde

[tex] \frac{1}{2} \: ore = \frac{1}{2} \times 3600 \: secunde \\ \\ \frac{1}{2} \times 3600 = \frac{1}{1} \times 1800 = \frac{1800}{1} = 1800 \: secunde[/tex]

2.

[tex]1 \frac{1}{2} \: ore = .....secunde \\ \\ 1 \frac{1}{2} \times 3600 \\ \\ \frac{1 \times 2 + 1}{2} \times 3600 \\ \\ \frac{2 + 1}{1} \times 1800 = \\ \\ = \frac{3 \times 1800}{1} = \frac{5400}{1} = 5400 \div 1 = 5400 \: secunde[/tex]

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