Vraag 10

voorbeelden van een juiste berekening:

•Een koe mag maximaal600\times2{,}5=1500600\times2{,}5=1500m$600 \times 2{,}5=1500 \mathrm{mg}$600 \times 2{,}5=1500 \mathrm{mg}$600 \times 2{,}5=1500 \mathrm{mg}mg PA eten. Dat is 0,0015 kg.

1 kg hooi bevat 0,3 kg jakobskruiskruid met 0,2% aan PA's.

1 kg hooi bevat dus0{,}03\times\frac{0{,}2}{100}=0{,}00006~0{,}03\times\frac{0{,}2}{100}=0{,}00006~k0{,}03\times\frac{0{,}2}{100}=0{,}00006~kg0{,}03\times\frac{0{,}2}{10}=0{,}00006~kg0{,}03\times\frac{0{,}2}{1}=0{,}00006~kg0{,}03\times\frac{0{,}2}{\placeholder{}}=0{,}00006~kg0{,}03\times0{,}2=0{,}00006~kg0{,}03\times0{,}2/=0{,}00006~kg0{,}03\times0{,}2/1=0{,}00006~kg0{,}03\times0{,}2/10=0{,}00006~kg$0{,}03 \times 0{,}2 / 100=0{,}00006 \mathrm{~kg}kg PA.

De koe kan dan maximaal \frac{0{,}0015}{0{,}00006}=25\frac{0{,}0015}{0{,}00006}=2\frac{0{,}0015}{0{,}00006}=\frac{0{,}0015}{0{,}00006}\frac{0{,}0015}{0{,}0000}\frac{0{,}0015}{0{,}000}\frac{0{,}0015}{0{,}0006}\frac{0{,}0015}{0{,}000}\frac{0{,}0015}{0{,}00}\frac{0{,}0015}{0{,}0}\frac{0{,}0015}{0{,}}\frac{0{,}0015}{0}\frac{0{,}0015}{\placeholder{}}0{,}00150{,}0010{,}000{,}00{,}0kg hooi eten.

•De dodelijke dosis is600\times2{,}5=1500$600 \times 2{,}5=1500 \mathrm{mg}mg, dus 1,5 gram PA.

Van de droge plant is de concentratie PA 0,2%.

Een koe krijgt deze dosis binnen als ze\frac{1{,}5}{0{,}002}=750\frac{1{,}5}{0{,}002}0{,}002=750\frac{1{,}5}{0{,}00}0{,}002=750\frac{1{,}5}{0{,}0}0{,}002=750\frac{1{,}5}{0{,}}0{,}002=750\frac{1{,}5}{0}0{,}002=750\frac{1{,}5}{\placeholder{}}0{,}002=7501{,}50{,}002=750$1{,}5 / 0{,}002=750gram plant eet. Omdat hooi 3% plant bevat, zit dat dus in$750 \mathrm{~g} \times 100 / 3=25 \mathrm{~kg}hooi.

•600\times2,5=1500.\text{ }\frac{1500}{0{,}002}=750000600\times2,5=1500.\text{ }\frac{1500}{0{,}002}0,002=750000600\times2,5=1500.\text{ }\frac{1500}{0{,}00}0,002=750000600\times2,5=1500.\text{ }\frac{1500}{0{,}0}0,002=750000600\times2,5=1500.\text{ }\frac{1500}{0{,}}0,002=750000600\times2,5=1500.\text{ }\frac{1500}{0}0,002=750000600\times2,5=1500.\text{ }\frac{1500}{\placeholder{}}0,002=750000600\times2,5=1500.\text{ }15000,002=750000600\times2,5=1500.\text{ }1500/0,002=750000

\frac{750000}{0{,}03}=25.000.000\frac{750000}{0{,}03}=25.000.0002\frac{750000}{0{,}03}=25.000.00025\frac{750000}{0{,}03}=25.000.00025\frac{750000}{0{,}03}=25.000.00025(\frac{750000}{0{,}03}=25.000.00025(k\frac{750000}{0{,}03}=25.000.00025(kg\frac{750000}{0{,}03}=25.000.00025(kg)\frac{750000}{0{,}03}=25.000.000m25(kg)\frac{750000}{0{,}03}=25.000.000m25(kg)\frac{750000}{0{,}03}=25.000.000mg25(kg)\frac{750000}{0{,}03}0=25.000.000mg25(kg)\frac{750000}{0{,}03}0,=25.000.000mg25(kg)\frac{750000}{0{,}03}0,0=25.000.000mg25(kg)\frac{750000}{0{,}03}0,03=25.000.000mg25(kg)\frac{750000}{0{,}0}0,03=25.000.000mg25(kg)\frac{750000}{0{,}}0,03=25.000.000mg25(kg)\frac{750000}{0}0,03=25.000.000mg25(kg)\frac{750000}{\placeholder{}}0,03=25.000.000mg25(kg)7500000,03=25.000.000mg25(kg)—> 25 (kg)