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) 28/07/2021 Bởi Lydia 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)
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 Bình luận
$x=(42-4,2.10+76:7,6):(0,01.0,1)$ $x=(42-42+10):\dfrac{1}{1000}$ $x=10.1000=10000$ ——————– $y=(689,7+0,3):(7,4:0,2-2,2-1,5)$ $y=690:(37-2,2-1,5)$ $y=690:(\dfrac{174}{5}-\dfrac{3}{2})$ $y=690:(\dfrac{348}{10}-\dfrac{15}{10})$ $y=690:\dfrac{333}{10}=690.\dfrac{10}{333}=\dfrac{2300}{11}=20,7$ Từ hai điều trên $→x>y$ Vậy $x>y$ Bình luận
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
$x=(42-4,2.10+76:7,6):(0,01.0,1)$
$x=(42-42+10):\dfrac{1}{1000}$
$x=10.1000=10000$
——————–
$y=(689,7+0,3):(7,4:0,2-2,2-1,5)$
$y=690:(37-2,2-1,5)$
$y=690:(\dfrac{174}{5}-\dfrac{3}{2})$
$y=690:(\dfrac{348}{10}-\dfrac{15}{10})$
$y=690:\dfrac{333}{10}=690.\dfrac{10}{333}=\dfrac{2300}{11}=20,7$
Từ hai điều trên
$→x>y$
Vậy $x>y$