Express 3*(4*5) as a common fraction given a*b= (10a+b)/(a+b). Note that a and b are single-digit positive numbers.

a*b= (10a+b)/(a+b)

3*(4*5)

First solve the ones in the bracket first

That's

(4 * 5) is

We have

3 * 9

That's

The final answer is

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