Rekenregels (reeks 1)

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Pas de rekenregels toe en bereken

1. \(\log 5 + \log0,02\)
2. \(\log 20 + \log0,05\)
3. \(\log 20000 - \log20\)
4. \(\log 200 + \log0,005\)
5. \(\log 10 + \log0,001\)
6. \(\log 1 - \log100\)
7. \(\log 0,004 - \log0,4\)
8. \(\log 0,25 - \log2,5\)
9. \(\log 200 + \log0,0005\)
10. \(\log 2500 - \log250\)
11. \(\log 10 + \log10\)
12. \(\log 0,025 - \log2,5\)

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Pas de rekenregels toe en bereken

Verbetersleutel

1. \(\log 5 + \log0,02\\ = \log(5 \cdot 0,02 ) \\ = \log ( 0,1) \\ =-1\)
2. \(\log 20 + \log0,05\\ = \log(20 \cdot 0,05 ) \\ = \log ( 1) \\ =0\)
3. \(\log 20000 - \log20\\ = \log(20000 : 20 ) \\ = \log ( 1000) \\ =3\)
4. \(\log 200 + \log0,005\\ = \log(200 \cdot 0,005 ) \\ = \log ( 1) \\ =0\)
5. \(\log 10 + \log0,001\\ = \log(10 \cdot 0,001 ) \\ = \log ( 0,01) \\ =-2\)
6. \(\log 1 - \log100\\ = \log(1 : 100 ) \\ = \log ( 0,01) \\ =-2\)
7. \(\log 0,004 - \log0,4\\ = \log(0,004 : 0,4 ) \\ = \log ( 0,01) \\ =-2\)
8. \(\log 0,25 - \log2,5\\ = \log(0,25 : 2,5 ) \\ = \log ( 0,1) \\ =-1\)
9. \(\log 200 + \log0,0005\\ = \log(200 \cdot 0,0005 ) \\ = \log ( 0,1) \\ =-1\)
10. \(\log 2500 - \log250\\ = \log(2500 : 250 ) \\ = \log ( 10) \\ =1\)
11. \(\log 10 + \log10\\ = \log(10 \cdot 10 ) \\ = \log ( 100) \\ =2\)
12. \(\log 0,025 - \log2,5\\ = \log(0,025 : 2,5 ) \\ = \log ( 0,01) \\ =-2\)