Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(2a+b\text{ [met a = 4 en b = -1]}\)
2. \(ab+2b-8\text{ [met a = -3 en b = 4]}\)
3. \(ab-2b+4\text{ [met a = 5 en b = -3]}\)
4. \(4ab-4b-9\text{ [met a = 4 en b = -4]}\)
5. \(a+2b\text{ [met a = 5 en b = 2]}\)
6. \(7a+b\text{ [met a = 2 en b = -2]}\)
7. \(3ab+b-8\text{ [met a = -4 en b = 6]}\)
8. \(a^2-b\text{ [met a = -3 en b = 6]}\)
9. \(5a^2+4b\text{ [met a = 4 en b = -2]}\)
10. \(4a^2+4b\text{ [met a = 1 en b = 2]}\)
11. \(3ab-3b+3\text{ [met a = 3 en b = 1]}\)
12. \(2a-b\text{ [met a = 4 en b = -3]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2a+b&=2.a+1.b \text{ [met a = 4 en b = -1]}\\&=2.4+1.(-1)\\&=7\\ \end{align}\)
2. \(\begin{align} ab+2b-8&=1.a.b+2.b-8 \text{ [met a = -3 en b = 4]}\\&=1.(-3).4+2.4-8\\&=-12\\ \end{align}\)
3. \(\begin{align} ab-2b+4&=1.a.b-2.b+4 \text{ [met a = 5 en b = -3]}\\&=1.5.(-3)-2.(-3)+4\\&=-5\\ \end{align}\)
4. \(\begin{align} 4ab-4b-9&=4.a.b-4.b-9 \text{ [met a = 4 en b = -4]}\\&=4.4.(-4)-4.(-4)-9\\&=-57\\ \end{align}\)
5. \(\begin{align} a+2b&=1.a+2.b \text{ [met a = 5 en b = 2]}\\&=1.5+2.2\\&=9\\ \end{align}\)
6. \(\begin{align} 7a+b&=7.a+1.b \text{ [met a = 2 en b = -2]}\\&=7.2+1.(-2)\\&=12\\ \end{align}\)
7. \(\begin{align} 3ab+b-8&=3.a.b+1.b-8 \text{ [met a = -4 en b = 6]}\\&=3.(-4).6+1.6-8\\&=-74\\ \end{align}\)
8. \(\begin{align} a^2-b&=1.a^2-1.b \text{ [met a = -3 en b = 6]}\\&=1.(-3)^2-1.6\\&=3\\ \end{align}\)
9. \(\begin{align} 5a^2+4b&=5.a^2+4.b \text{ [met a = 4 en b = -2]}\\&=5.4^2+4.(-2)\\&=72\\ \end{align}\)
10. \(\begin{align} 4a^2+4b&=4.a^2+4.b \text{ [met a = 1 en b = 2]}\\&=4.1^2+4.2\\&=12\\ \end{align}\)
11. \(\begin{align} 3ab-3b+3&=3.a.b-3.b+3 \text{ [met a = 3 en b = 1]}\\&=3.3.1-3.1+3\\&=9\\ \end{align}\)
12. \(\begin{align} 2a-b&=2.a-1.b \text{ [met a = 4 en b = -3]}\\&=2.4-1.(-3)\\&=11\\ \end{align}\)