Getal & Ruimte (12e editie) - vwo wiskunde B

'Wortels vereenvoudigen'.

2 vwo 5.3 Wortels herleiden

Wortels vereenvoudigen (5)

opgave 1

Herleid.

2p

a

\(\sqrt{48} + \sqrt{75}\)

Optellen (5)
0085 - Wortels vereenvoudigen - basis - 0ms

a

\(\sqrt{48} + \sqrt{75} = \sqrt{16} ⋅ \sqrt{3} + \sqrt{25} ⋅ \sqrt{3} = 4 \sqrt{3} + 5 \sqrt{3} \text{.}\)

1p

○

\(4 \sqrt{3} + 5 \sqrt{3} = 9 \sqrt{3} \text{.}\)

1p

1p

b

\(\sqrt{50}\)

FactorVoorWortelteken (1)
0086 - Wortels vereenvoudigen - basis - 0ms

b

\(\sqrt{50} = \sqrt{25} ⋅ \sqrt{2} = 5 \sqrt{2} \text{.}\)

1p

1p

c

\(6 \sqrt{48}\)

FactorVoorWortelteken (2)
0087 - Wortels vereenvoudigen - basis - 0ms

c

\(6 \sqrt{48} = 6 ⋅ \sqrt{16} ⋅ \sqrt{3} = 6 ⋅ 4 ⋅ \sqrt{3} = 24 \sqrt{3} \text{.}\)

1p

2p

d

\(7 \sqrt{50} - 4 \sqrt{200}\)

Optellen (6)
0088 - Wortels vereenvoudigen - basis - 0ms

d

\(7 \sqrt{50} - 4 \sqrt{200} = 7 ⋅ \sqrt{25} ⋅ \sqrt{2} - 4 ⋅ \sqrt{100} ⋅ \sqrt{2} \text{.}\)

1p

○

\(7 ⋅ 5 ⋅ \sqrt{2} - 4 ⋅ 10 ⋅ \sqrt{2} = 35 \sqrt{2} - 40 \sqrt{2} = -5 \sqrt{2} \text{.}\)

1p

opgave 2

Herleid.

1p

\(\sqrt{1\frac{11}{25}}\)

BreukInWortel (1)
008b - Wortels vereenvoudigen - basis - 31ms

○

\(\sqrt{1\frac{11}{25}} = \sqrt{\frac{36}{25}} = {\sqrt{36} \over \sqrt{25}} = \frac{6}{5} = 1\frac{1}{5} \text{.}\)

1p

3 vwo 5.5 Wortels herleiden

Wortels vereenvoudigen (6)

opgave 1

Herleid.

1p

a

\({7 \over 3 \sqrt{7}}\)

WortelInNoemer
0089 - Wortels vereenvoudigen - basis - 0ms

a

\({7 \over 3 \sqrt{7}} = {7 \over 3 \sqrt{7}} ⋅ {\sqrt{7} \over \sqrt{7}} = {7 \sqrt{7} \over 3 ⋅ 7} = \frac{1}{3} \sqrt{7} \text{.}\)

1p

1p

b

\(\sqrt{\frac{11}{64}}\)

BreukInWortel (2)
008c - Wortels vereenvoudigen - basis - 1ms

b

\(\sqrt{\frac{11}{64}} = {\sqrt{11} \over \sqrt{64}} = {\sqrt{11} \over 8} = \frac{1}{8} \sqrt{11} \text{.}\)

1p

1p

c

\(\sqrt{\frac{1}{12}}\)

BreukInWortel (3)
008d - Wortels vereenvoudigen - basis - 0ms

c

\(\sqrt{\frac{1}{12}} = {\sqrt{1} \over \sqrt{12}} = {1 \over \sqrt{12}} ⋅ {\sqrt{12} \over \sqrt{12}} = {\sqrt{12} \over 12} = \frac{1}{12} \sqrt{12} = \frac{1}{12} ⋅ 2 ⋅ \sqrt{3} = \frac{1}{6} \sqrt{3} \text{.}\)

1p

1p

d

\(\sqrt{10\frac{1}{3}}\)

BreukInWortel (4)
008e - Wortels vereenvoudigen - basis - 0ms

d

\(\sqrt{10\frac{1}{3}} = \sqrt{\frac{31}{3}} = {\sqrt{31} \over \sqrt{3}} ⋅ {\sqrt{3} \over \sqrt{3}} = {\sqrt{93} \over 3} = \frac{1}{3} \sqrt{93} \text{.}\)

1p

opgave 2

Herleid.

1p

a

\({36 \sqrt{60} \over 4 \sqrt{3}}\)

Delen (4)
00dc - Wortels vereenvoudigen - basis - 1ms

a

\({36 \sqrt{60} \over 4 \sqrt{3}} = {36 \over 4} ⋅ {\sqrt{60} \over \sqrt{3}} = 9 \sqrt{20} = 9 ⋅ \sqrt{4} ⋅ \sqrt{5} = 9 ⋅ 2 ⋅ \sqrt{5} = 18 \sqrt{5}\)

1p

1p

b

\(3 \sqrt{7} ⋅ 5 \sqrt{14}\)

Vermenigvuldigen (5)
00dd - Wortels vereenvoudigen - basis - 2ms - data pool: #22 (2ms)

b

\(3 \sqrt{7} ⋅ 5 \sqrt{14} = 15 \sqrt{98} = 15 ⋅ \sqrt{49} ⋅ \sqrt{2} = 15 ⋅ 7 ⋅ \sqrt{2} = 105 \sqrt{2}\)

1p

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