( 3/5 - 2,4x) : 1 5/8 = -4
( 3/5 - 2,4x) = -4 . 13/8
3/5 - 2,4x = -13/2
2,4x = 3/5 - (-13/2)
2,4x = 6/10 - (-65/10)
2,4x = 71/10
x = 71/10 : 2,4
x = 71/10 . 10/24
x = 71/24.
Vi may bi chap choe nen minh khong dung duoc cac ki hieu toan mong ban thong cam.
Chu y: 1 5/8 chinh la mot nam phan tam do.
Ta có: \(\left(\dfrac{3}{5}-2,4x\right):1\dfrac{5}{8}=-4.\)
\(\left(\dfrac{3}{5}-\dfrac{12}{5}x\right):\dfrac{13}{8}=-4.\)
\(\left(\dfrac{3}{5}-\dfrac{12}{5}x\right)=-4.\dfrac{13}{8}.\)
\(\left(\dfrac{3}{5}-\dfrac{12}{5}x\right)=\dfrac{-13}{2}.\)
\(\dfrac{12}{5}x=\dfrac{3}{5}-\dfrac{-13}{2}.\)
\(\dfrac{12}{5}x=\dfrac{6}{10}+\dfrac{65}{10}.\)
\(\dfrac{12}{5}x=\dfrac{71}{10}.\)
\(x=\dfrac{71}{10}:\dfrac{12}{5}.\)
\(x=\dfrac{71}{10}.\dfrac{5}{12}.\)
\(x=\dfrac{355}{120}.\)
Rút gọn: \(x=\dfrac{71}{24}=2\dfrac{23}{24}.\)
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\(\left(\dfrac{3}{5}-2,4x\right):1\dfrac{5}{8}=-4\)
\(\Rightarrow\left(\dfrac{3}{5}-\dfrac{12}{5}x\right):\dfrac{13}{8}=-4\)
\(\Rightarrow\dfrac{3}{5}-\dfrac{12}{5}x=-4.\dfrac{13}{8}\)
\(\Rightarrow\dfrac{3}{5}-\dfrac{12}{5}x=\dfrac{-13}{2}\)
\(\Rightarrow\dfrac{12}{5}x=\dfrac{3}{5}+\dfrac{13}{2}\)
\(\Rightarrow\dfrac{12}{5}x=\dfrac{71}{10}\)
\(\Rightarrow x=\dfrac{71}{10}:\dfrac{12}{5}\)
\(\Rightarrow x=\dfrac{71}{24}\)
