Revert "Update Exercise_1.tex"

This reverts commit e68eab9f3497f989d769b18f4e410cf14418fe4e.
Revert "Update Exercise_1.tex"

This reverts commit 6a869d16129dfd2216633e886d8e4ae3709f4955.
Revert "Ich mache aufgabe 2"

This reverts commit 97fcc80f97a5227c887e9317478a6dada425e541.