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$a\t \dfrac{1}{b} = \dfrac{a}{b}$

Theory

a1b=aba\cdot \dfrac{1}{b} = \dfrac{a}{b}

When a number is multiplied by a fraction, it's the same thing as multiplying the numerator by that number. If the numerator is 11 it's multiplied by 1,1, and thus, doesn't change its value. 213=213=23 2\cdot \dfrac{1}{3} = \dfrac{2\cdot 1}{3}=\dfrac{2}{3} This can be seen as the factor replacing the numerator if the numerator is 1.1.