Lettervormen getalwaarde

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Bereken de getalwaarde

1. \(5ab-5b-10\text{ [met a = 2 en b = 3]}\)
2. \(4ab-3b+7\text{ [met a = 3 en b = 4]}\)
3. \(3ab+4b-15\text{ [met a = -2 en b = -5]}\)
4. \(4a^2+6b\text{ [met a = 2 en b = -3]}\)
5. \(2a^2+4b\text{ [met a = 6 en b = 4]}\)
6. \(a+b\text{ [met a = -3 en b = -4]}\)
7. \(ab-b+4\text{ [met a = -2 en b = 5]}\)
8. \(5a^2-3b\text{ [met a = -2 en b = -4]}\)
9. \(a+6b\text{ [met a = 3 en b = -1]}\)
10. \(4a-10b\text{ [met a = -4 en b = -4]}\)
11. \(5ab-3b-9\text{ [met a = -5 en b = -3]}\)
12. \(4ab-b-13\text{ [met a = 3 en b = -4]}\)

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 5ab-5b-10&=5.a.b-5.b-10 \text{ [met a = 2 en b = 3]}\\&=5.2.3-5.3-10\\&=5\\ \end{align}\)
2. \(\begin{align} 4ab-3b+7&=4.a.b-3.b+7 \text{ [met a = 3 en b = 4]}\\&=4.3.4-3.4+7\\&=43\\ \end{align}\)
3. \(\begin{align} 3ab+4b-15&=3.a.b+4.b-15 \text{ [met a = -2 en b = -5]}\\&=3.(-2).(-5)+4.(-5)-15\\&=-5\\ \end{align}\)
4. \(\begin{align} 4a^2+6b&=4.a^2+6.b \text{ [met a = 2 en b = -3]}\\&=4.2^2+6.(-3)\\&=-2\\ \end{align}\)
5. \(\begin{align} 2a^2+4b&=2.a^2+4.b \text{ [met a = 6 en b = 4]}\\&=2.6^2+4.4\\&=88\\ \end{align}\)
6. \(\begin{align} a+b&=1.a+1.b \text{ [met a = -3 en b = -4]}\\&=1.(-3)+1.(-4)\\&=-7\\ \end{align}\)
7. \(\begin{align} ab-b+4&=1.a.b-1.b+4 \text{ [met a = -2 en b = 5]}\\&=1.(-2).5-1.5+4\\&=-11\\ \end{align}\)
8. \(\begin{align} 5a^2-3b&=5.a^2-3.b \text{ [met a = -2 en b = -4]}\\&=5.(-2)^2-3.(-4)\\&=32\\ \end{align}\)
9. \(\begin{align} a+6b&=1.a+6.b \text{ [met a = 3 en b = -1]}\\&=1.3+6.(-1)\\&=-3\\ \end{align}\)
10. \(\begin{align} 4a-10b&=4.a-10.b \text{ [met a = -4 en b = -4]}\\&=4.(-4)-10.(-4)\\&=24\\ \end{align}\)
11. \(\begin{align} 5ab-3b-9&=5.a.b-3.b-9 \text{ [met a = -5 en b = -3]}\\&=5.(-5).(-3)-3.(-3)-9\\&=75\\ \end{align}\)
12. \(\begin{align} 4ab-b-13&=4.a.b-1.b-13 \text{ [met a = 3 en b = -4]}\\&=4.3.(-4)-1.(-4)-13\\&=-57\\ \end{align}\)