so sánh x, y sau đây: x =(42-4,2.10+76:7,6):(0,01.0,1), y=(689,7+0,3):(7,4:0,2-2,2-1,5)

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1. x=(42-4,2.10+76:7,6):(0,01.0,1)=(42−42+10):$\frac{1}{1000}$ =10.1000=10000

   y=(689,7+0,3):(7,4:0,2−2,2−1,5)=690:(37−2,2−1,5)=690:$(\dfrac{174}{5}-\dfrac{3}{2})$=690:$(\dfrac{348}{10}-\dfrac{15}{10})$==690:$\dfrac{333}{10}$=690.$\dfrac{10}{333}$=$\dfrac{2300}{11}$=20,7

   vì x>y→x>y

   nên x>y

   Trả lời

2. $x=(42-4,2.10+76:7,6):(0,01.0,1)$

   $x=(42-42+10):\dfrac{1}{1000}$

   $x=10.1000=10000$

   ——————–

   $y=(689,7+0,3):(7,4:0,2-2,2-1,5)$

   $y=690:(37-2,2-1,5)$

   $y=690:(\dfrac{174}{5}-\dfrac{3}{2})$

   $y=690:(\dfrac{348}{10}-\dfrac{15}{10})$

   $y=690:\dfrac{333}{10}=690.\dfrac{10}{333}=\dfrac{2300}{11}=20,7$

   Từ hai điều trên

   $→x>y$

   Vậy $x>y$

   Trả lời