Question

Confused! Which letter is the mistake?

Answer 1

Answer:

(1)

Step-by-step explanation:

You can not cancel "x" in this way:

$\dfrac{4x\!\!\!\!\!\diagup^0-8}{10y}\cdot\dfrac{15y^2}{5x\!\!\!\!\!\diagup_{1x}-10}$

In this expression, you can not cancel "x".