Lettervormen getalwaarde

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Bereken de getalwaarde

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

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Bereken de getalwaarde

Verbetersleutel

1. \(\begin{align} 10a+5b&=10.a+5.b \text{ [met a = 5 en b = -5]}\\&=10.5+5.(-5)\\&=25\\ \end{align}\)
2. \(\begin{align} 3ab+3b-11&=3.a.b+3.b-11 \text{ [met a = 3 en b = -3]}\\&=3.3.(-3)+3.(-3)-11\\&=-47\\ \end{align}\)
3. \(\begin{align} 4ab-3b-6&=4.a.b-3.b-6 \text{ [met a = -5 en b = 2]}\\&=4.(-5).2-3.2-6\\&=-52\\ \end{align}\)
4. \(\begin{align} 2a^2+b&=2.a^2+1.b \text{ [met a = 1 en b = 6]}\\&=2.1^2+1.6\\&=8\\ \end{align}\)
5. \(\begin{align} 5ab+5b+6&=5.a.b+5.b+6 \text{ [met a = 2 en b = -2]}\\&=5.2.(-2)+5.(-2)+6\\&=-24\\ \end{align}\)
6. \(\begin{align} ab+4b+10&=1.a.b+4.b+10 \text{ [met a = 3 en b = 6]}\\&=1.3.6+4.6+10\\&=52\\ \end{align}\)
7. \(\begin{align} ab+b+5&=1.a.b+1.b+5 \text{ [met a = -5 en b = 3]}\\&=1.(-5).3+1.3+5\\&=-7\\ \end{align}\)
8. \(\begin{align} 8a-10b&=8.a-10.b \text{ [met a = -5 en b = -3]}\\&=8.(-5)-10.(-3)\\&=-10\\ \end{align}\)
9. \(\begin{align} 4a+3b&=4.a+3.b \text{ [met a = 2 en b = 2]}\\&=4.2+3.2\\&=14\\ \end{align}\)
10. \(\begin{align} 9a+8b&=9.a+8.b \text{ [met a = 4 en b = -2]}\\&=9.4+8.(-2)\\&=20\\ \end{align}\)
11. \(\begin{align} 5a^2-6b&=5.a^2-6.b \text{ [met a = 4 en b = 2]}\\&=5.4^2-6.2\\&=68\\ \end{align}\)
12. \(\begin{align} 4ab+3b-7&=4.a.b+3.b-7 \text{ [met a = -1 en b = 5]}\\&=4.(-1).5+3.5-7\\&=-12\\ \end{align}\)