Rekenregels (reeks 1)

Hoofdmenu Eentje per keer  🖨

Pas de rekenregels toe en bereken

1. \(\log 20 + \log0{,}5\)
2. \(\log 20000 - \log2\)
3. \(\log 10 + \log10\)
4. \(\log 25 + \log0{,}0004\)
5. \(\log 50 + \log200\)
6. \(\log 4 + \log2{,}5\)
7. \(\log 4 - \log40\)
8. \(\log 2 + \log50\)
9. \(\log 0{,}008 - \log0{,}8\)
10. \(\log 5000 - \log5\)
11. \(\log 0{,}2 - \log20\)
12. \(\log 250 - \log2{,}5\)

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Pas de rekenregels toe en bereken

Verbetersleutel

1. \(\log 20 + \log0{,}5\\ = \log(20 \cdot 0{,}5 ) \\ = \log ( 10) \\ =1\)
2. \(\log 20000 - \log2\\ = \log(20000 : 2 ) \\ = \log ( 10000) \\ =4\)
3. \(\log 10 + \log10\\ = \log(10 \cdot 10 ) \\ = \log ( 100) \\ =2\)
4. \(\log 25 + \log0{,}0004\\ = \log(25 \cdot 0{,}0004 ) \\ = \log ( 0{,}01) \\ =-2\)
5. \(\log 50 + \log200\\ = \log(50 \cdot 200 ) \\ = \log ( 10000) \\ =4\)
6. \(\log 4 + \log2{,}5\\ = \log(4 \cdot 2{,}5 ) \\ = \log ( 10) \\ =1\)
7. \(\log 4 - \log40\\ = \log(4 : 40 ) \\ = \log ( 0{,}1) \\ =-1\)
8. \(\log 2 + \log50\\ = \log(2 \cdot 50 ) \\ = \log ( 100) \\ =2\)
9. \(\log 0{,}008 - \log0{,}8\\ = \log(0{,}008 : 0{,}8 ) \\ = \log ( 0{,}01) \\ =-2\)
10. \(\log 5000 - \log5\\ = \log(5000 : 5 ) \\ = \log ( 1000) \\ =3\)
11. \(\log 0{,}2 - \log20\\ = \log(0{,}2 : 20 ) \\ = \log ( 0{,}01) \\ =-2\)
12. \(\log 250 - \log2{,}5\\ = \log(250 : 2{,}5 ) \\ = \log ( 100) \\ =2\)