1. Which of the following expression could not be considered as a rational algebraic expression?

A.
[tex] \sqrt{50 \times } [/tex]
B.
[tex]5x \frac{1}{2} [/tex]
C.
[tex]4y2 - 9z2[/tex]
D.
[tex] \frac{a - b}{b + a} [/tex]
please answer if anybody know this...

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