Rekenregels (reeks 1)

Hoofdmenu Eentje per keer  🖨

Pas de rekenregels toe en bereken

1. \(\log 0{,}8 + \log1{,}25\)
2. \(\log 5 - \log5\)
3. \(\log 20 + \log500\)
4. \(\log 4000 - \log40\)
5. \(\log 80 + \log1{,}25\)
6. \(\log 8 + \log0{,}00125\)
7. \(\log 100 + \log100\)
8. \(\log 500 + \log0{,}2\)
9. \(\log 20 + \log0{,}005\)
10. \(\log 2000 - \log0{,}2\)
11. \(\log 100 + \log0{,}01\)
12. \(\log 2000 - \log20\)

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Pas de rekenregels toe en bereken

Verbetersleutel

1. \(\log 0{,}8 + \log1{,}25\\ = \log(0{,}8 \cdot 1{,}25 ) \\ = \log ( 1) \\ =0\)
2. \(\log 5 - \log5\\ = \log(5 : 5 ) \\ = \log ( 1) \\ =0\)
3. \(\log 20 + \log500\\ = \log(20 \cdot 500 ) \\ = \log ( 10000) \\ =4\)
4. \(\log 4000 - \log40\\ = \log(4000 : 40 ) \\ = \log ( 100) \\ =2\)
5. \(\log 80 + \log1{,}25\\ = \log(80 \cdot 1{,}25 ) \\ = \log ( 100) \\ =2\)
6. \(\log 8 + \log0{,}00125\\ = \log(8 \cdot 0{,}00125 ) \\ = \log ( 0{,}01) \\ =-2\)
7. \(\log 100 + \log100\\ = \log(100 \cdot 100 ) \\ = \log ( 10000) \\ =4\)
8. \(\log 500 + \log0{,}2\\ = \log(500 \cdot 0{,}2 ) \\ = \log ( 100) \\ =2\)
9. \(\log 20 + \log0{,}005\\ = \log(20 \cdot 0{,}005 ) \\ = \log ( 0{,}1) \\ =-1\)
10. \(\log 2000 - \log0{,}2\\ = \log(2000 : 0{,}2 ) \\ = \log ( 10000) \\ =4\)
11. \(\log 100 + \log0{,}01\\ = \log(100 \cdot 0{,}01 ) \\ = \log ( 1) \\ =0\)
12. \(\log 2000 - \log20\\ = \log(2000 : 20 ) \\ = \log ( 100) \\ =2\)