Lettervormen getalwaarde

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Bereken de getalwaarde

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

Bereken de getalwaarde

Verbetersleutel

  1. \(\begin{align} a-8b&=1.a-8.b \text{ [met a = -2 en b = 1]}\\&=1.(-2)-8.1\\&=-10\\ \end{align}\)
  2. \(\begin{align} 5a-4b&=5.a-4.b \text{ [met a = -1 en b = 5]}\\&=5.(-1)-4.5\\&=-25\\ \end{align}\)
  3. \(\begin{align} 3ab-2b-12&=3.a.b-2.b-12 \text{ [met a = -5 en b = 5]}\\&=3.(-5).5-2.5-12\\&=-97\\ \end{align}\)
  4. \(\begin{align} 9a-4b&=9.a-4.b \text{ [met a = 2 en b = 5]}\\&=9.2-4.5\\&=-2\\ \end{align}\)
  5. \(\begin{align} 2a-6b&=2.a-6.b \text{ [met a = -1 en b = -5]}\\&=2.(-1)-6.(-5)\\&=28\\ \end{align}\)
  6. \(\begin{align} 5a-3b&=5.a-3.b \text{ [met a = -2 en b = 2]}\\&=5.(-2)-3.2\\&=-16\\ \end{align}\)
  7. \(\begin{align} 4ab-5b-7&=4.a.b-5.b-7 \text{ [met a = 3 en b = 2]}\\&=4.3.2-5.2-7\\&=7\\ \end{align}\)
  8. \(\begin{align} 3ab+4b-8&=3.a.b+4.b-8 \text{ [met a = 4 en b = 5]}\\&=3.4.5+4.5-8\\&=72\\ \end{align}\)
  9. \(\begin{align} 4ab+2b+12&=4.a.b+2.b+12 \text{ [met a = -4 en b = 3]}\\&=4.(-4).3+2.3+12\\&=-30\\ \end{align}\)
  10. \(\begin{align} 4a^2+3b&=4.a^2+3.b \text{ [met a = -1 en b = -3]}\\&=4.(-1)^2+3.(-3)\\&=-5\\ \end{align}\)
  11. \(\begin{align} ab-b-13&=1.a.b-1.b-13 \text{ [met a = 6 en b = 2]}\\&=1.6.2-1.2-13\\&=-3\\ \end{align}\)
  12. \(\begin{align} a-2b&=1.a-2.b \text{ [met a = 4 en b = -1]}\\&=1.4-2.(-1)\\&=6\\ \end{align}\)
Oefeningengenerator vanhoeckes.be/wiskunde 2022-06-27 08:26:24