Question

express the following rational number with positive denominator -18/-21​

Answer 1

$\frac{ - 18}{ - 21}$

now by using cancellation method we cancel -ve sign and then

on both numerator and denominator divide by 3

so

$\frac{18}{21} \\ = \\ \frac{18 \div 3}{21 \div 3} \\ = \\ \frac{6}{7}$

therefore we have a positive denominator i.e 7

and hence it's in positive form

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Answer 2

Answer:

-3×-6÷-3×-7

=18÷21 :. it is expressed by a positive denominator