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a) 2/9 : 2/3 x 1/2
= 2/9 x 3/2 x 1/2
= 6/18 x 1/2
= 6/36
b) 2 + 1/4 x 4/3
= 2 + 4/7
= 2/1(7) + 4/7
= 14/7 + 4/7
= 18/7
c) 3 x 1/2 x 1/4
= 3/1 x 1/2 x 1/4
= 3/2 x 1/4
= 3/8
#Hok_tốt
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1/2+1/3x1/9=1/2+1/27=27/54+2/54=29/54
k nha mình nhanh nhất
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a)\frac{1}{5}\times\frac{1}{2}:\frac{1}{3}=\frac{1}{5}\times\frac{1}{2}\times\frac{3}{1}=\frac{1\times1\times3}{5\times2\times1}=\frac{1\times3}{5\times2}=\frac{3}{10}\)
\(b)\frac{2}{9}:\frac{2}{3}\times\frac{1}{2}=\frac{2}{9}\times\frac{3}{2}\times\frac{1}{2}=\frac{2\times3\times1}{9\times2\times2}=\frac{1\times1\times1}{3\times1\times2}=\frac{1}{6}\)
\(c)\frac{1}{2}\times\frac{1}{3}+\frac{1}{4}=\frac{1}{6}+\frac{1}{4}=\frac{2}{12}+\frac{3}{12}=\frac{2+3}{12}=\frac{5}{12}\)
d, Tương tự như câu c
P/S : Bất phương trình????
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{2}\)- \(\frac{1}{3}\)x \(\frac{1}{4}\)
= \(\frac{1}{2}\)- \(\frac{1}{12}\)
= \(\frac{6}{12}\)- \(\frac{1}{12}\)
= \(\frac{5}{12}\)
tk nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{7}{3}\times\dfrac{1}{2}+\dfrac{1}{7}=\dfrac{7}{6}+\dfrac{1}{7}=\dfrac{49}{42}+\dfrac{6}{42}=\dfrac{55}{42}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
43𝑥1⋅92⋅𝑥4𝑥163⋅𝑥5⋅254⋅𝑥6
12𝑥12⋅𝑥4𝑥163⋅𝑥5⋅254⋅𝑥6
chúc bạn học tốt
4/3x1x9/2x4x16/3x5x25/4x6=172800/144=1200/1
tk nha
13/18 nha bn
\(\frac{8}{9}-\frac{1}{3}\times\frac{1}{2}\)
\(=\frac{8}{9}-\frac{1}{6}\)
\(=\frac{13}{18}\)
_Chúc bạn học tốt_