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Multiply their numerators and their denominators.

What must be done to multiply two rational expressions?

Why?

Use the rule for multiplying rational expressions.

9(x+1)/4x³

Solve (x+1/x) * (9/4x²)

What must be done to divide two rational expressions?

Multiply the first by the reciprocal of the second.

6/25xy

Solve (9x/35y) ÷(15x²/14)