Rekenregels (reeks 1)

Hoofdmenu Eentje per keer  🖨

Pas de rekenregels toe en bereken

1. \(\log 80 - \log80\)
2. \(\log 20 + \log500\)
3. \(\log 400000 - \log40\)
4. \(\log 0{,}8 - \log0{,}8\)
5. \(\log 200 + \log0{,}5\)
6. \(\log 0{,}2 - \log20\)
7. \(\log 20 + \log0{,}0005\)
8. \(\log 50 + \log0{,}02\)
9. \(\log 400 - \log0{,}4\)
10. \(\log 0{,}8 + \log0{,}0125\)
11. \(\log 25 + \log40\)
12. \(\log 0{,}8 + \log0{,}125\)

---

Pas de rekenregels toe en bereken

Verbetersleutel

1. \(\log 80 - \log80\\ = \log(80 : 80 ) \\ = \log ( 1) \\ =0\)
2. \(\log 20 + \log500\\ = \log(20 \cdot 500 ) \\ = \log ( 10000) \\ =4\)
3. \(\log 400000 - \log40\\ = \log(400000 : 40 ) \\ = \log ( 10000) \\ =4\)
4. \(\log 0{,}8 - \log0{,}8\\ = \log(0{,}8 : 0{,}8 ) \\ = \log ( 1) \\ =0\)
5. \(\log 200 + \log0{,}5\\ = \log(200 \cdot 0{,}5 ) \\ = \log ( 100) \\ =2\)
6. \(\log 0{,}2 - \log20\\ = \log(0{,}2 : 20 ) \\ = \log ( 0{,}01) \\ =-2\)
7. \(\log 20 + \log0{,}0005\\ = \log(20 \cdot 0{,}0005 ) \\ = \log ( 0{,}01) \\ =-2\)
8. \(\log 50 + \log0{,}02\\ = \log(50 \cdot 0{,}02 ) \\ = \log ( 1) \\ =0\)
9. \(\log 400 - \log0{,}4\\ = \log(400 : 0{,}4 ) \\ = \log ( 1000) \\ =3\)
10. \(\log 0{,}8 + \log0{,}0125\\ = \log(0{,}8 \cdot 0{,}0125 ) \\ = \log ( 0{,}01) \\ =-2\)
11. \(\log 25 + \log40\\ = \log(25 \cdot 40 ) \\ = \log ( 1000) \\ =3\)
12. \(\log 0{,}8 + \log0{,}125\\ = \log(0{,}8 \cdot 0{,}125 ) \\ = \log ( 0{,}1) \\ =-1\)