Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 5ab-5b+9&=5.a.b-5.b+9 \text{ [met a = 1 en b = 5]}\\&=5.1.5-5.5+9\\&=9\\ \end{align}\)
2. \(\begin{align} 10a+10b&=10.a+10.b \text{ [met a = 1 en b = -5]}\\&=10.1+10.(-5)\\&=-40\\ \end{align}\)
3. \(\begin{align} 7a+2b&=7.a+2.b \text{ [met a = -1 en b = -5]}\\&=7.(-1)+2.(-5)\\&=-17\\ \end{align}\)
4. \(\begin{align} 4ab-2b-9&=4.a.b-2.b-9 \text{ [met a = -2 en b = -5]}\\&=4.(-2).(-5)-2.(-5)-9\\&=41\\ \end{align}\)
5. \(\begin{align} 3ab+b+14&=3.a.b+1.b+14 \text{ [met a = -1 en b = -4]}\\&=3.(-1).(-4)+1.(-4)+14\\&=22\\ \end{align}\)
6. \(\begin{align} a+8b&=1.a+8.b \text{ [met a = 1 en b = -5]}\\&=1.1+8.(-5)\\&=-39\\ \end{align}\)
7. \(\begin{align} 4a-4b&=4.a-4.b \text{ [met a = 5 en b = 1]}\\&=4.5-4.1\\&=16\\ \end{align}\)
8. \(\begin{align} 4a^2+4b&=4.a^2+4.b \text{ [met a = -5 en b = -4]}\\&=4.(-5)^2+4.(-4)\\&=84\\ \end{align}\)
9. \(\begin{align} 4ab-5b-14&=4.a.b-5.b-14 \text{ [met a = -5 en b = -3]}\\&=4.(-5).(-3)-5.(-3)-14\\&=61\\ \end{align}\)
10. \(\begin{align} ab+5b-1&=1.a.b+5.b-1 \text{ [met a = -2 en b = 1]}\\&=1.(-2).1+5.1-1\\&=2\\ \end{align}\)
11. \(\begin{align} 3ab+4b-6&=3.a.b+4.b-6 \text{ [met a = -5 en b = 2]}\\&=3.(-5).2+4.2-6\\&=-28\\ \end{align}\)
12. \(\begin{align} 2ab+b+5&=2.a.b+1.b+5 \text{ [met a = 3 en b = 5]}\\&=2.3.5+1.5+5\\&=40\\ \end{align}\)