Giúp mình nhaaaaaaaaa! Chắc bài 1

1.

$\dfrac{18}{27}$ = $\dfrac{18 : 9}{27 : 9}$ = $\dfrac{2}{3}$

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$\dfrac{35}{25}$ = $\dfrac{35 : 5}{25: 5}$ = $\dfrac{7}{5}$

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$\dfrac{54}{72}$ = $\dfrac{54 : 18}{72 : 18}$ = $\dfrac{3}{4}$

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$\dfrac{78}{66}$ = $\dfrac{78 : 6}{66 : 6}$ = $\dfrac{13}{11}$

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$\dfrac{92}{100}$ = $\dfrac{92 : 4}{100 : 4}$ = $\dfrac{13}{25}$

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$\dfrac{75}{125}$ = $\dfrac{75 : 25}{125 : 25}$ = $\dfrac{3}{5}$

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$\dfrac{126}{165}$ = $\dfrac{126 : 3}{165 : 3}$ = $\dfrac{42}{55}$

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$\dfrac{150}{300}$ = $\dfrac{150 : 150}{300 : 150}$ = $\dfrac{1}{2}$

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$\dfrac{1717}{1515}$ = $\dfrac{1717 : 101}{1515 : 101}$ = $\dfrac{17}{15}$

$\text{Xin hay nhất cho nhóm}$