Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2ab-5b-14&=2.a.b-5.b-14 \text{ [met a = -1 en b = 5]}\\&=2.(-1).5-5.5-14\\&=-49\\ \end{align}\)
2. \(\begin{align} 9a-6b&=9.a-6.b \text{ [met a = 4 en b = 1]}\\&=9.4-6.1\\&=30\\ \end{align}\)
3. \(\begin{align} 5a^2-4b&=5.a^2-4.b \text{ [met a = 4 en b = -1]}\\&=5.4^2-4.(-1)\\&=84\\ \end{align}\)
4. \(\begin{align} ab-5b+6&=1.a.b-5.b+6 \text{ [met a = 1 en b = -2]}\\&=1.1.(-2)-5.(-2)+6\\&=14\\ \end{align}\)
5. \(\begin{align} 2a^2-5b&=2.a^2-5.b \text{ [met a = -1 en b = -4]}\\&=2.(-1)^2-5.(-4)\\&=22\\ \end{align}\)
6. \(\begin{align} 5ab+2b-3&=5.a.b+2.b-3 \text{ [met a = -3 en b = 1]}\\&=5.(-3).1+2.1-3\\&=-16\\ \end{align}\)
7. \(\begin{align} 4a+9b&=4.a+9.b \text{ [met a = 4 en b = -2]}\\&=4.4+9.(-2)\\&=-2\\ \end{align}\)
8. \(\begin{align} 2ab+3b-4&=2.a.b+3.b-4 \text{ [met a = -5 en b = 5]}\\&=2.(-5).5+3.5-4\\&=-39\\ \end{align}\)
9. \(\begin{align} 2ab-2b-9&=2.a.b-2.b-9 \text{ [met a = 5 en b = 2]}\\&=2.5.2-2.2-9\\&=7\\ \end{align}\)
10. \(\begin{align} 5a-2b&=5.a-2.b \text{ [met a = 3 en b = 3]}\\&=5.3-2.3\\&=9\\ \end{align}\)
11. \(\begin{align} 8a-10b&=8.a-10.b \text{ [met a = 3 en b = 2]}\\&=8.3-10.2\\&=4\\ \end{align}\)
12. \(\begin{align} 9a+3b&=9.a+3.b \text{ [met a = 1 en b = 5]}\\&=9.1+3.5\\&=24\\ \end{align}\)