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\(x\times2\dfrac{2}{3}=3\dfrac{4}{8}+6\dfrac{5}{12}\)
\(x\times\dfrac{8}{3}=\dfrac{28}{8}+\dfrac{77}{12}\)
\(x\times\dfrac{8}{3}=\dfrac{119}{12}\)
\(x=\dfrac{119}{12}:\dfrac{8}{3}\)
\(x=\dfrac{119}{32}\)
\(x\) x 8/3 = 7/2 + 77/12
\(x\) x 8/3 = 119/12
\(x\) = 119/12 : 8/3
x = 119/32
\(\frac{2}{5}< \frac{x}{8}< \frac{3}{5}\)
\(\Rightarrow\frac{16}{40}< \frac{5x}{40}< \frac{24}{40}\)
\(\Rightarrow5x\in\left\{17;18;19;20;21;22;23\right\}\)
\(\Rightarrow x\in\left\{\frac{17}{5};\frac{18}{5};\frac{19}{5};4;\frac{21}{5};\frac{22}{5};\frac{23}{5}\right\}\)
chúc bạn học tốt
\(3-\left(\frac{5}{\frac{3}{8}}+x-\frac{7}{\frac{5}{24}}\right):\frac{16}{\frac{2}{3}}=2\)
\(\Rightarrow3-\left(\frac{40}{3}+x-\frac{168}{5}\right):24=2\)
\(\Rightarrow\left(-\frac{304}{15}+x\right):24=1\)
\(\Rightarrow\frac{-304}{15}+x=24\)
\(\Rightarrow x=\frac{664}{15}\)
a. 128 - 3 x (X + 2) = 23
3 x (X + 2) = 128 - 23
X + 2 = 105 : 3
X = 35 - 2
X = 33
b. (12 x X - 64) x 8 = 4,64
12 x X - 64 = 4,64 : 8
12 x X = 0,58 + 64
X = 64,58 : 12
X = \(\frac{3229}{600}\)
c. [(4 x X + 28) x 3 + 55] : 5 = 35
[(4 x X + 28) x 3 + 55] = 35 x 5
(4 x X + 28) x 3 = 175 - 55
4 x X + 28 = 120 : 3
4 x X = 40 - 28
X = 12 : 4
X = 3
d. 720 : [41 - (2 x X - 5)] = 8 x 5
41 - (2 x X - 5) = 720 : (8 x 5)
2 x X - 5 = 41 - 18
2 x X = 23 + 5
X = 28 : 2
X = 14
x nhỏ : dấu nhân
X lớn : X
`3/4 : x =1 1/2`
`=> 3/4 : x= 3/2`
`=>x= 3/4 : 3/2`
`=>x= 3/4 xx 2/3`
`=> x= 6/12`
`=> x= 1/2`
Vậy `x=1/2`
Thay `5/8-x` thì
`5/8-1/2= 5/8- 4/8=1/8`
\(\dfrac{3}{4}:x=1\dfrac{1}{2}\)
\(\dfrac{3}{4}:x=\dfrac{3}{2}\)
\(x=\dfrac{3}{4}:\dfrac{3}{2}\)
\(x=\dfrac{1}{2}\)
Vậy: \(\dfrac{5}{8}-x=\dfrac{5}{8}-\dfrac{1}{2}=\dfrac{1}{8}\)
\(2-x\times\frac{2}{5}=\frac{8}{5}\)
\(x\times\frac{2}{5}=2-\frac{8}{5}\)
\(x\times\frac{2}{5}=\frac{2}{5}\)
\(x=\frac{2}{5}:\frac{2}{5}\)
\(x=1\)
2-x*2/5=8/5
x*2/5=2-8/5=2/5
x=2/5:2/5=1