Question

Rút gọn các phân số sau

27/-72.   -2020/-4040     11.8-11.3/17-6    20-12.20/30+30.10

Answer 1

27/-72 = 27:(-9)/-72:(-9) = -3/8

-2020:(-2020)/-4040:(-2020) = 1/2

11.8-11.3/17-6= 11.(8-3)/11= 11.5/11= 5

20-12.30/30+30.10 = 20-360/30+300 = -340/330 = -34/33 = -1 1/33

Answer 2

\(\text{#TuanNam}\)

`27/-72=-27/72=`\(\dfrac{-27\div9}{72\div9}=\dfrac{-3}{8}\) 

`-2020/-4040=202/404=`\(\dfrac{202\div202}{404\div202}=\dfrac{1}{2}\)

`11*8-`\(\dfrac{11\cdot3}{17-6}=88-3=85\) 

\(\dfrac{20-12\cdot20}{30+30\cdot10}=\dfrac{20\cdot\left(1-12\right)}{30\cdot\left(1+10\right)}=\dfrac{20\cdot-11}{30\cdot11}=-\dfrac{2}{3}\)