Lettervormen getalwaarde

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Bereken de getalwaarde

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

Bereken de getalwaarde

Verbetersleutel

  1. \(\begin{align} 3ab+4b-7&=3.a.b+4.b-7 \text{ [met a = -3 en b = -4]}\\&=3.(-3).(-4)+4.(-4)-7\\&=13\\ \end{align}\)
  2. \(\begin{align} a+8b&=1.a+8.b \text{ [met a = -4 en b = -4]}\\&=1.(-4)+8.(-4)\\&=-36\\ \end{align}\)
  3. \(\begin{align} 4a^2+b&=4.a^2+1.b \text{ [met a = -4 en b = -3]}\\&=4.(-4)^2+1.(-3)\\&=61\\ \end{align}\)
  4. \(\begin{align} 9a-5b&=9.a-5.b \text{ [met a = -1 en b = -2]}\\&=9.(-1)-5.(-2)\\&=1\\ \end{align}\)
  5. \(\begin{align} 7a+10b&=7.a+10.b \text{ [met a = -1 en b = -1]}\\&=7.(-1)+10.(-1)\\&=-17\\ \end{align}\)
  6. \(\begin{align} 4ab-5b-10&=4.a.b-5.b-10 \text{ [met a = -2 en b = -1]}\\&=4.(-2).(-1)-5.(-1)-10\\&=3\\ \end{align}\)
  7. \(\begin{align} 9a-6b&=9.a-6.b \text{ [met a = 3 en b = -2]}\\&=9.3-6.(-2)\\&=39\\ \end{align}\)
  8. \(\begin{align} 5a^2+4b&=5.a^2+4.b \text{ [met a = -4 en b = 3]}\\&=5.(-4)^2+4.3\\&=92\\ \end{align}\)
  9. \(\begin{align} 3ab+b-10&=3.a.b+1.b-10 \text{ [met a = 1 en b = -2]}\\&=3.1.(-2)+1.(-2)-10\\&=-18\\ \end{align}\)
  10. \(\begin{align} 3a^2+4b&=3.a^2+4.b \text{ [met a = 4 en b = -2]}\\&=3.4^2+4.(-2)\\&=40\\ \end{align}\)
  11. \(\begin{align} 3ab-3b-1&=3.a.b-3.b-1 \text{ [met a = -2 en b = 1]}\\&=3.(-2).1-3.1-1\\&=-10\\ \end{align}\)
  12. \(\begin{align} ab-b-13&=1.a.b-1.b-13 \text{ [met a = 3 en b = 5]}\\&=1.3.5-1.5-13\\&=-3\\ \end{align}\)
Oefeningengenerator vanhoeckes.be/wiskunde 2021-12-02 02:32:46