Optellen en aftrekken (a+bi)

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Bereken

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

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Bereken

Verbetersleutel

1. \((6-4i)-(6-4i)= 6-4i -6+4i =\color{red}{6-6}\color{blue}{-4i +4i}=\color{red}{0}\)
2. \((7-7i)+(-8+7i)= 7-7i -8+7i =\color{red}{7-8}\color{blue}{-7i +7i}=\color{red}{-1}\)
3. \((5+5i)-(-3-9i)= 5+5i +3+9i =\color{red}{5+3}\color{blue}{+5i +9i}=\color{red}{8}\color{blue}{+14i}\)
4. \((10+i)-(-4+2i)= 10+i +4-2i =\color{red}{10+4}\color{blue}{+i -2i}=\color{red}{14}\color{blue}{-i}\)
5. \((-4+8i)+(5-7i)= -4+8i +5-7i =\color{red}{-4+5}\color{blue}{+8i -7i}=\color{red}{1}\color{blue}{+i}\)
6. \((9+6i)-(-4-7i)= 9+6i +4+7i =\color{red}{9+4}\color{blue}{+6i +7i}=\color{red}{13}\color{blue}{+13i}\)
7. \((7-9i)-(4+6i)= 7-9i -4-6i =\color{red}{7-4}\color{blue}{-9i -6i}=\color{red}{3}\color{blue}{-15i}\)
8. \((-9+10i)-(-3-2i)= -9+10i +3+2i =\color{red}{-9+3}\color{blue}{+10i +2i}=\color{red}{-6}\color{blue}{+12i}\)
9. \((-8-5i)+(-3+2i)= -8-5i -3+2i =\color{red}{-8-3}\color{blue}{-5i +2i}=\color{red}{-11}\color{blue}{-3i}\)
10. \((2-7i)+(-5-5i)= 2-7i -5-5i =\color{red}{2-5}\color{blue}{-7i -5i}=\color{red}{-3}\color{blue}{-12i}\)
11. \((10-i)-(-3-8i)= 10-i +3+8i =\color{red}{10+3}\color{blue}{-i +8i}=\color{red}{13}\color{blue}{+7i}\)
12. \((-8-i)-(3-i)= -8-i -3+i =\color{red}{-8-3}\color{blue}{-i +i}=\color{red}{-11}\)