- 1)=x^2×x(x^2

-1), the landlord only needs to change the legal x into a number.

2. Landlord, you must have typed the second question wrong. Look at the second half of the formula.

a/b=20^2×a/b,20^2=400，

That is, a/b = 400.

×

A/b, where both a and b are positive integers, is obviously impossible.