Toán Lớp 7: 1. Tính
a) 5/9 : ( 1/11 – 5/22 ) + 5/9 : ( 1/15 – 2/3 )
Mong mn giúp đỡ ạ. Mik cảm ơn. >.<
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Toán Lớp 7: 1. Tính
a) 5/9 : ( 1/11 – 5/22 ) + 5/9 : ( 1/15 – 2/3 )
Mong mn giúp đỡ ạ. Mik cảm ơn. >.<
Comments ( 2 )
$\dfrac{5}{9}:(\dfrac{1}{11}-\dfrac{5}{22})+\dfrac{5}{9}:(\dfrac{1}{15}-\dfrac{2}{3})$
$=\dfrac{5}{9}.(\dfrac{1}{\dfrac{1}{11}-\dfrac{5}{22}})+\dfrac{5}{9}.(\dfrac{1}{\dfrac{1}{15}-\dfrac{2}{3}})$
$=\dfrac{5}{9}.(\dfrac{1}{\dfrac{1}{11}-\dfrac{5}{22}}+\dfrac{1}{\dfrac{1}{15}-\dfrac{2}{3}})$
$=\dfrac{5}{9}.(\dfrac{1}{\dfrac{-3}{22}}+\dfrac{1}{\dfrac{-3}{5}})$
$=\dfrac{5}{9}.(\dfrac{-22}{3}+\dfrac{-5}{3})$
$=-5$