Rekenregels (reeks 1)

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Pas de rekenregels toe en bereken

1. \(\log 25 + \log0,0004\)
2. \(\log 0,5 - \log5\)
3. \(\log 80 + \log1,25\)
4. \(\log 1000 - \log10\)
5. \(\log 40 + \log2,5\)
6. \(\log 50 - \log5\)
7. \(\log 5 + \log0,02\)
8. \(\log 2 + \log500\)
9. \(\log 0,2 - \log2\)
10. \(\log 200000 - \log20\)
11. \(\log 0,04 - \log0,4\)
12. \(\log 4 + \log0,0025\)

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Pas de rekenregels toe en bereken

Verbetersleutel

1. \(\log 25 + \log0,0004\\ = \log(25 \cdot 0,0004 ) \\ = \log ( 0,01) \\ =-2\)
2. \(\log 0,5 - \log5\\ = \log(0,5 : 5 ) \\ = \log ( 0,1) \\ =-1\)
3. \(\log 80 + \log1,25\\ = \log(80 \cdot 1,25 ) \\ = \log ( 100) \\ =2\)
4. \(\log 1000 - \log10\\ = \log(1000 : 10 ) \\ = \log ( 100) \\ =2\)
5. \(\log 40 + \log2,5\\ = \log(40 \cdot 2,5 ) \\ = \log ( 100) \\ =2\)
6. \(\log 50 - \log5\\ = \log(50 : 5 ) \\ = \log ( 10) \\ =1\)
7. \(\log 5 + \log0,02\\ = \log(5 \cdot 0,02 ) \\ = \log ( 0,1) \\ =-1\)
8. \(\log 2 + \log500\\ = \log(2 \cdot 500 ) \\ = \log ( 1000) \\ =3\)
9. \(\log 0,2 - \log2\\ = \log(0,2 : 2 ) \\ = \log ( 0,1) \\ =-1\)
10. \(\log 200000 - \log20\\ = \log(200000 : 20 ) \\ = \log ( 10000) \\ =4\)
11. \(\log 0,04 - \log0,4\\ = \log(0,04 : 0,4 ) \\ = \log ( 0,1) \\ =-1\)
12. \(\log 4 + \log0,0025\\ = \log(4 \cdot 0,0025 ) \\ = \log ( 0,01) \\ =-2\)