Question

Answer 1

bài 5 bỏ câu 1 ạ

 

Answer 2

2)
\(2\dfrac{2}{3}:x=1\dfrac{7}{9}:0,2\)
\(\dfrac{8}{3}:x=\dfrac{16}{9}:\dfrac{1}{5}\)
\(\dfrac{8}{3}:x=\dfrac{80}{9}\)
x=\(\dfrac{80}{9}:\dfrac{8}{3}\)
x=10/3
3)
\(3\dfrac{4}{5}:40\dfrac{8}{15}=0,25:x\)
\(\dfrac{19}{5}:\dfrac{608}{15}=\dfrac{1}{4}:x\)
\(\dfrac{3}{32}=\dfrac{1}{4}:x\)
\(x=\dfrac{1}{4}:\dfrac{3}{32}\)
x=8/3
 

Answer 3

4)
2,5 :4x=0,5:0,2
2,5 :4x=2,5
4x= 2,5:2,5
4x=1
x=1/4
 

Answer 4

5)\(\dfrac{1}{5}x:3=\dfrac{2}{3}:0,25\)
\(\dfrac{1}{5}x:3=\dfrac{8}{3}\)
\(\dfrac{1}{5}x=\dfrac{8}{3}.3\)
\(\dfrac{1}{5}x=8\)
x=40

Answer 5

2: Ta có: \(\dfrac{8}{3}:x=\dfrac{16}{9}:\dfrac{1}{5}\)

\(\Leftrightarrow\dfrac{8}{3}:x=\dfrac{16}{9}\cdot5=\dfrac{80}{9}\)

\(\Leftrightarrow x=\dfrac{8}{3}:\dfrac{80}{9}=\dfrac{8}{3}\cdot\dfrac{9}{80}=\dfrac{3}{10}\)

3: Ta có: \(\dfrac{19}{5}:\dfrac{608}{15}=\dfrac{1}{4}:x\)

\(\Leftrightarrow\dfrac{1}{4}:x=\dfrac{3}{32}\)

hay \(x=\dfrac{8}{3}\)