Tìm x
60%+x+0,4+x+x:3=2
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\(60\%x+0,4x+x:3=2\\ \Leftrightarrow\left(60\%+0,4+\dfrac{1}{3}\right)x=2\\ \Rightarrow\dfrac{4}{3}x=2\\ \Rightarrow x=\dfrac{3}{2}\)
\(60\%x+0,4x+x:3=2\)
\(x.\left(60\%+0,4+\dfrac{1}{3}\right)=2\)
\(x.\dfrac{4}{3}=2\)
\(x=2:\dfrac{4}{3}\)
\(x=\dfrac{3}{2}\)
a) \(1\frac{2}{7} = 1 + \frac{2}{7} = \frac{9}{2}\)
\(\begin{array}{l}x:1\frac{2}{7} = - 3,5\\x:\frac{9}{7} = - \frac{7}{2}\\x = - \frac{7}{2}.\frac{9}{7}\\x = - \frac{9}{2}\end{array}\)
b) \(0,4.x - \frac{1}{5}.x = \frac{3}{4}\)
\(\begin{array}{l}\frac{2}{5}.x - \frac{1}{5}.x = \frac{3}{4}\\\left( {\frac{2}{5} - \frac{1}{5}} \right).x = \frac{3}{4}\\\frac{1}{5}.x = \frac{3}{4}\\x = \frac{3}{4}:\frac{1}{5}\\x = \frac{3}{4}.5\\x = \frac{{15}}{4}\end{array}\)
\(\dfrac{7}{2}\) : \(\dfrac{2}{5}\) = x : \(\dfrac{8}{7}\)
x : \(\dfrac{8}{7}\) = \(\dfrac{7}{2}\) : \(\dfrac{2}{5}\)
x : \(\dfrac{8}{7}\) = \(\dfrac{35}{4}\)
x = \(\dfrac{35}{4}\) . \(\dfrac{8}{7}\)
x = 10
\(a,x\times3=8,4\)
\(x=8,4\div3\)
\(x=2,8\)
\(b,5\times x=0,25\)
\(x=0,25\div5\)
\(x=0,05\)
\(c,0,16\div x=2-0,4\)
\(0,16\div x=1,6\)
\(x=0,16\div1,6\)
\(x=0,1\)
Học tốt
x×3=8,4
x=8,4:3
x=2,8
vậy x=2,8
5×x=0,25
x=0,25:5
x=0,05
0,16:x=2-0,4
0,16:x=1,6
x=0,16:1,6
x=0,1
vậy x=0,1
`Answer:`
Vì đề bài khá khó nhìn nên mình làm thành hai bài nhé. Đề nào đúng thì bạn tham khảo.
`x : (9 1/2 - 3/2 ) = 0,4 + 2/9 - 2/11 . 1/6 + 8/9 - 8/11`
`=> x : ( 19/2 - 3/2 ) = 28/45 - 1/33 + 8/9 - 8/11`
`=> x : 8 = 293/495 + 8/9 - 8/11`
`=> x : 8 = 733/495 - 8/11`
`=> x : 8 = 373/495`
`=> x = 373/495 .8`
`=> x = 2984/495`
`x : ( 9 1/2 - 3/2 ) = (0,4 + 2/9 - 2/11 )/(1,6 + 8/9 - 8/11 )`
`=> x : (19/2 - 3/2 ) = (2 . (1/5 + 1/9 - 1/11))/(8.(1/5 + 1/9 - 1/11))`
`=> x : 8 = 2/8`
`=> x = 2/8 .8`
`=> x = 2`
60%+x+0,4+x+x:3=2
3/5+x+2/5+x+x.1/3=2
(3/5+2/5)+x.(1+1+1/3)=2
1+x.10/3=2
suy ra x.10/3=1
x=1:10/3
x=3/10
vậy x=3/10 nha