The denominator of the fraction remains the same, and the denominator of the molecular fraction remains the same. If the molecule expands to five times, the fractional value will also expand to five times. (right)

Analysis: This question is correct. The numerator (dividend) is expanded to 5 times, and the denominator (divisor) is unchanged, so the fractional value is expanded to 5 times. Although there are cases where the numerator is equal to zero, the essence of this problem is correct.

If the denominator of a fraction contains prime factors 2 and 5, it must be reduced to a finite fraction. (error)

Because half equals four eighths, their decimal units are the same. (error)

Three quarters of a pile of fertilizer is equivalent to three quarters of a ton of fertilizer. (error)