Question

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Answer 1

5:

a: \(-\dfrac{24}{36}=\dfrac{-24:12}{36:12}=-\dfrac{2}{3}\)

b: \(-\dfrac{5}{20}=\dfrac{-5:5}{20:5}=\dfrac{-1}{4}\)

c: \(\dfrac{28}{52}=\dfrac{28:4}{52:4}=\dfrac{7}{13}\)

e: \(\dfrac{11\cdot3-11\cdot8}{17-6}=\dfrac{11\cdot\left(3-8\right)}{11}=-5\)

f: \(\dfrac{1+2+3+...+9}{11+12+...+19}=\dfrac{9\cdot\dfrac{10}{2}}{9\cdot\dfrac{\left(19+11\right)}{2}}=\dfrac{10}{2}:\dfrac{30}{2}=\dfrac{1}{3}\)