Lettervormen getalwaarde

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Bereken de getalwaarde

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

Bereken de getalwaarde

Verbetersleutel

  1. \(\begin{align} 6a+5b&=6.a+5.b \text{ [met a = 3 en b = -4]}\\&=6.3+5.(-4)\\&=-2\\ \end{align}\)
  2. \(\begin{align} 4ab+4b-8&=4.a.b+4.b-8 \text{ [met a = 3 en b = -5]}\\&=4.3.(-5)+4.(-5)-8\\&=-88\\ \end{align}\)
  3. \(\begin{align} 4ab-b+6&=4.a.b-1.b+6 \text{ [met a = 1 en b = -5]}\\&=4.1.(-5)-1.(-5)+6\\&=-9\\ \end{align}\)
  4. \(\begin{align} 5a+2b&=5.a+2.b \text{ [met a = -3 en b = -4]}\\&=5.(-3)+2.(-4)\\&=-23\\ \end{align}\)
  5. \(\begin{align} 4a^2-5b&=4.a^2-5.b \text{ [met a = -3 en b = 1]}\\&=4.(-3)^2-5.1\\&=31\\ \end{align}\)
  6. \(\begin{align} ab-b+10&=1.a.b-1.b+10 \text{ [met a = -1 en b = 6]}\\&=1.(-1).6-1.6+10\\&=-2\\ \end{align}\)
  7. \(\begin{align} 5a-4b&=5.a-4.b \text{ [met a = 2 en b = 3]}\\&=5.2-4.3\\&=-2\\ \end{align}\)
  8. \(\begin{align} 5ab-b-10&=5.a.b-1.b-10 \text{ [met a = -1 en b = 4]}\\&=5.(-1).4-1.4-10\\&=-34\\ \end{align}\)
  9. \(\begin{align} 5a^2-3b&=5.a^2-3.b \text{ [met a = 2 en b = -2]}\\&=5.2^2-3.(-2)\\&=26\\ \end{align}\)
  10. \(\begin{align} 4a^2-6b&=4.a^2-6.b \text{ [met a = -1 en b = -4]}\\&=4.(-1)^2-6.(-4)\\&=28\\ \end{align}\)
  11. \(\begin{align} 5ab+b-6&=5.a.b+1.b-6 \text{ [met a = -4 en b = 2]}\\&=5.(-4).2+1.2-6\\&=-44\\ \end{align}\)
  12. \(\begin{align} 4a^2+5b&=4.a^2+5.b \text{ [met a = -3 en b = 6]}\\&=4.(-3)^2+5.6\\&=66\\ \end{align}\)
Oefeningengenerator vanhoeckes.be/wiskunde 2024-03-29 14:34:54