Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 2a+3b&=2.a+3.b \text{ [met a = 3 en b = -4]}\\&=2.3+3.(-4)\\&=-6\\ \end{align}\)
2. \(\begin{align} 3a+3b&=3.a+3.b \text{ [met a = -5 en b = -3]}\\&=3.(-5)+3.(-3)\\&=-24\\ \end{align}\)
3. \(\begin{align} 7a+3b&=7.a+3.b \text{ [met a = 1 en b = 2]}\\&=7.1+3.2\\&=13\\ \end{align}\)
4. \(\begin{align} 5a+3b&=5.a+3.b \text{ [met a = 3 en b = -1]}\\&=5.3+3.(-1)\\&=12\\ \end{align}\)
5. \(\begin{align} 10a+5b&=10.a+5.b \text{ [met a = -5 en b = 3]}\\&=10.(-5)+5.3\\&=-35\\ \end{align}\)
6. \(\begin{align} 4ab+3b+4&=4.a.b+3.b+4 \text{ [met a = 6 en b = 6]}\\&=4.6.6+3.6+4\\&=166\\ \end{align}\)
7. \(\begin{align} 4ab-b+1&=4.a.b-1.b+1 \text{ [met a = -1 en b = 6]}\\&=4.(-1).6-1.6+1\\&=-29\\ \end{align}\)
8. \(\begin{align} 10a+3b&=10.a+3.b \text{ [met a = 5 en b = 1]}\\&=10.5+3.1\\&=53\\ \end{align}\)
9. \(\begin{align} a-10b&=1.a-10.b \text{ [met a = 3 en b = 5]}\\&=1.3-10.5\\&=-47\\ \end{align}\)
10. \(\begin{align} 5ab+5b-2&=5.a.b+5.b-2 \text{ [met a = 5 en b = -2]}\\&=5.5.(-2)+5.(-2)-2\\&=-62\\ \end{align}\)
11. \(\begin{align} 5a^2-6b&=5.a^2-6.b \text{ [met a = 6 en b = -2]}\\&=5.6^2-6.(-2)\\&=192\\ \end{align}\)
12. \(\begin{align} a^2+5b&=1.a^2+5.b \text{ [met a = 6 en b = 6]}\\&=1.6^2+5.6\\&=66\\ \end{align}\)