Optellen en aftrekken (a+bi)

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Bereken

1. \((9-8i)+(-8-2i)\)
2. \((3-5i)+(-8-7i)\)
3. \((-5+10i)+(-7-5i)\)
4. \((6-6i)-(9-5i)\)
5. \((10-3i)-(5-3i)\)
6. \((-5-4i)+(6-8i)\)
7. \((-7-10i)-(-3-5i)\)
8. \((-6-4i)-(-7-2i)\)
9. \((-2+3i)-(1-6i)\)
10. \((4-2i)+(-3+9i)\)
11. \((-7-i)+(-2+7i)\)
12. \((7+8i)-(-10+2i)\)

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Bereken

Verbetersleutel

1. \((9-8i)+(-8-2i)= 9-8i -8-2i =\color{red}{9-8}\color{blue}{-8i -2i}=\color{red}{1}\color{blue}{-10i}\)
2. \((3-5i)+(-8-7i)= 3-5i -8-7i =\color{red}{3-8}\color{blue}{-5i -7i}=\color{red}{-5}\color{blue}{-12i}\)
3. \((-5+10i)+(-7-5i)= -5+10i -7-5i =\color{red}{-5-7}\color{blue}{+10i -5i}=\color{red}{-12}\color{blue}{+5i}\)
4. \((6-6i)-(9-5i)= 6-6i -9+5i =\color{red}{6-9}\color{blue}{-6i +5i}=\color{red}{-3}\color{blue}{-i}\)
5. \((10-3i)-(5-3i)= 10-3i -5+3i =\color{red}{10-5}\color{blue}{-3i +3i}=\color{red}{5}\)
6. \((-5-4i)+(6-8i)= -5-4i +6-8i =\color{red}{-5+6}\color{blue}{-4i -8i}=\color{red}{1}\color{blue}{-12i}\)
7. \((-7-10i)-(-3-5i)= -7-10i +3+5i =\color{red}{-7+3}\color{blue}{-10i +5i}=\color{red}{-4}\color{blue}{-5i}\)
8. \((-6-4i)-(-7-2i)= -6-4i +7+2i =\color{red}{-6+7}\color{blue}{-4i +2i}=\color{red}{1}\color{blue}{-2i}\)
9. \((-2+3i)-(1-6i)= -2+3i -1+6i =\color{red}{-2-1}\color{blue}{+3i +6i}=\color{red}{-3}\color{blue}{+9i}\)
10. \((4-2i)+(-3+9i)= 4-2i -3+9i =\color{red}{4-3}\color{blue}{-2i +9i}=\color{red}{1}\color{blue}{+7i}\)
11. \((-7-i)+(-2+7i)= -7-i -2+7i =\color{red}{-7-2}\color{blue}{-i +7i}=\color{red}{-9}\color{blue}{+6i}\)
12. \((7+8i)-(-10+2i)= 7+8i +10-2i =\color{red}{7+10}\color{blue}{+8i -2i}=\color{red}{17}\color{blue}{+6i}\)