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Oplossing algebra problemen 75A..E |
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Opgave A
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x=?
Oplossing A
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Opgave B
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Omtrek ABCD=?
Oplossing B
Stel AD=a
6-a+8+a+8-a+6+a=28
Opgave C
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Oplossing C
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Opgave D
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x=?
Oplossing D
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Opgave E
x en y zijn positieve gehele getallen.
x + xy + y = 54.
x=? , y=?
Oplossing E
stel y=x+p.
x2+x(p+2)+p-54=0
discriminant = (p+2)2-4(p-54) moet kwadraat zijn.
p2 + 220 moet kwadraat zijn, dat klopt voor p=6.
x=4
y=10
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