Puzzle 3 - Lesson in Humility

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Koma
I wasn't just watching stuff all week, though! Hmm... oh yeah! I helped Usa-chan study. That was the plan, at least.
Usa
Thanks for offering your help, Koma-san!
Koma
Aw, it's nothing. It's the least I can do, as your senpai.
Koma
What are you studying today?
Usa
Math. I like math.
Usa
I was just about to tackle this one. Let's have a look together.
Koma
(Usa-chan is a couple of classes below me. This should be a breeze.)

Usa shows her a paper with the math problem.

Find all real values of x such that:

x² − 6x + 5 = |x − 1|

Koma
Oh yeah, this is uhh... that one that... uhh...
Koma
I mean, the one with the...
Koma
Ehhh?
Usa
It's okay. Let's try something easier.
Usa finds another math problem.
Koma
...
Koma
That is, eh, um... a triangle.
Usa
It sure is.
Koma
Right. Very... pointy.
Usa
Mhm.
Koma
Can you at least make fun of me? It would be less embarrassing than this.
Usa
Ahaha, I won't make fun of you.
Usa reaches for a book titled "Fun Math Problems" and opens it.
Usa
Here, let's try this instead. I'll help you.

Puzzle

Puzzle #3: Lesson in Humility

  • Each row should have every digit 1–5 exactly once
  • Each column should have every digit 1–5 exactly once
  • The cell groups must satisfy their arithmetic rules (+ addition, – subtraction, × multiplication, / division)
  • For example, if a group of two cells has a "5 +" rule, the two cells must give the number five when added together (either 1 and 4, or 2 and 3)
  • The order of the digits in the boxes doesn't matter (e.g. both 1,5 and 5,1 will satisfy "5 /").
2–
20×
20×
7+
2–
2/
6+
5+
2–
2/
15×
2/
Solve the puzzle to unlock