Rekenregels (reeks 1)

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Pas de rekenregels toe en bereken

1. \(\log 50 + \log0,0002\)
2. \(\log 25 + \log0,004\)
3. \(\log 50 + \log0,2\)
4. \(\log 200000 - \log20\)
5. \(\log 2 + \log0,005\)
6. \(\log 0,2 + \log0,05\)
7. \(\log 5 + \log200\)
8. \(\log 0,008 - \log0,8\)
9. \(\log 10 + \log100\)
10. \(\log 800 - \log0,8\)
11. \(\log 0,2 - \log2\)
12. \(\log 2 + \log5000\)

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Pas de rekenregels toe en bereken

Verbetersleutel

1. \(\log 50 + \log0,0002\\ = \log(50 \cdot 0,0002 ) \\ = \log ( 0,01) \\ =-2\)
2. \(\log 25 + \log0,004\\ = \log(25 \cdot 0,004 ) \\ = \log ( 0,1) \\ =-1\)
3. \(\log 50 + \log0,2\\ = \log(50 \cdot 0,2 ) \\ = \log ( 10) \\ =1\)
4. \(\log 200000 - \log20\\ = \log(200000 : 20 ) \\ = \log ( 10000) \\ =4\)
5. \(\log 2 + \log0,005\\ = \log(2 \cdot 0,005 ) \\ = \log ( 0,01) \\ =-2\)
6. \(\log 0,2 + \log0,05\\ = \log(0,2 \cdot 0,05 ) \\ = \log ( 0,01) \\ =-2\)
7. \(\log 5 + \log200\\ = \log(5 \cdot 200 ) \\ = \log ( 1000) \\ =3\)
8. \(\log 0,008 - \log0,8\\ = \log(0,008 : 0,8 ) \\ = \log ( 0,01) \\ =-2\)
9. \(\log 10 + \log100\\ = \log(10 \cdot 100 ) \\ = \log ( 1000) \\ =3\)
10. \(\log 800 - \log0,8\\ = \log(800 : 0,8 ) \\ = \log ( 1000) \\ =3\)
11. \(\log 0,2 - \log2\\ = \log(0,2 : 2 ) \\ = \log ( 0,1) \\ =-1\)
12. \(\log 2 + \log5000\\ = \log(2 \cdot 5000 ) \\ = \log ( 10000) \\ =4\)