Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(2a-4b\text{ [met a = -3 en b = -3]}\)
2. \(10a-3b\text{ [met a = 4 en b = 3]}\)
3. \(2ab-b+4\text{ [met a = 3 en b = -2]}\)
4. \(3ab+4b+1\text{ [met a = -4 en b = -5]}\)
5. \(3a+4b\text{ [met a = -4 en b = 4]}\)
6. \(4a+10b\text{ [met a = 5 en b = 4]}\)
7. \(2a-5b\text{ [met a = 3 en b = 2]}\)
8. \(4ab+3b+2\text{ [met a = -4 en b = 6]}\)
9. \(2ab+4b-10\text{ [met a = 3 en b = -4]}\)
10. \(2a^2-6b\text{ [met a = 6 en b = 3]}\)
11. \(5ab-b-14\text{ [met a = 6 en b = 1]}\)
12. \(5a^2-4b\text{ [met a = 1 en b = 4]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2a-4b&=2.a-4.b \text{ [met a = -3 en b = -3]}\\&=2.(-3)-4.(-3)\\&=6\\ \end{align}\)
2. \(\begin{align} 10a-3b&=10.a-3.b \text{ [met a = 4 en b = 3]}\\&=10.4-3.3\\&=31\\ \end{align}\)
3. \(\begin{align} 2ab-b+4&=2.a.b-1.b+4 \text{ [met a = 3 en b = -2]}\\&=2.3.(-2)-1.(-2)+4\\&=-6\\ \end{align}\)
4. \(\begin{align} 3ab+4b+1&=3.a.b+4.b+1 \text{ [met a = -4 en b = -5]}\\&=3.(-4).(-5)+4.(-5)+1\\&=41\\ \end{align}\)
5. \(\begin{align} 3a+4b&=3.a+4.b \text{ [met a = -4 en b = 4]}\\&=3.(-4)+4.4\\&=4\\ \end{align}\)
6. \(\begin{align} 4a+10b&=4.a+10.b \text{ [met a = 5 en b = 4]}\\&=4.5+10.4\\&=60\\ \end{align}\)
7. \(\begin{align} 2a-5b&=2.a-5.b \text{ [met a = 3 en b = 2]}\\&=2.3-5.2\\&=-4\\ \end{align}\)
8. \(\begin{align} 4ab+3b+2&=4.a.b+3.b+2 \text{ [met a = -4 en b = 6]}\\&=4.(-4).6+3.6+2\\&=-76\\ \end{align}\)
9. \(\begin{align} 2ab+4b-10&=2.a.b+4.b-10 \text{ [met a = 3 en b = -4]}\\&=2.3.(-4)+4.(-4)-10\\&=-50\\ \end{align}\)
10. \(\begin{align} 2a^2-6b&=2.a^2-6.b \text{ [met a = 6 en b = 3]}\\&=2.6^2-6.3\\&=54\\ \end{align}\)
11. \(\begin{align} 5ab-b-14&=5.a.b-1.b-14 \text{ [met a = 6 en b = 1]}\\&=5.6.1-1.1-14\\&=15\\ \end{align}\)
12. \(\begin{align} 5a^2-4b&=5.a^2-4.b \text{ [met a = 1 en b = 4]}\\&=5.1^2-4.4\\&=-11\\ \end{align}\)