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Lampshaded: "Charlie, I need some help. Does the stuff on the board even mean anything?"
Invoked: The class has an uneducated substitute teacher.
Exploited: Charlie is given a "math" test, scribbles all over it, and gets a perfect score.
Defied: Macy sees the nonsense on the board, shudders "Who thinks this is maths?", erases everything on the board and writes some actual maths.
Discussed: "I dread Maths class. I've never understood the weird symbols and formulas. It just makes no sense."
Conversed: "Why are the mathematical symbols on this show so inaccurate?"
Plotted A Good Waste: The writers want to make a Take That to incompetent teachers or to the education system itself, so they do their research on whatever level of math it is, and then intentionally portray it inaccurately.
Deconstructed: When the nonsense is discovered, the teachers are fired for their incompetence.