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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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_

bằng 29/54 nha bạn

1/2+1/3x1/9=1/2+1/27=27/54+2/54=29/54

k nha mình nhanh nhất

\(a)\frac{1}{5}\times\frac{1}{2}:\frac{1}{3}=\frac{1}{5}\times\frac{1}{2}\times\frac{3}{1}=\frac{1\times1\times3}{5\times2\times1}=\frac{1\times3}{5\times2}=\frac{3}{10}\)

\(b)\frac{2}{9}:\frac{2}{3}\times\frac{1}{2}=\frac{2}{9}\times\frac{3}{2}\times\frac{1}{2}=\frac{2\times3\times1}{9\times2\times2}=\frac{1\times1\times1}{3\times1\times2}=\frac{1}{6}\)

\(c)\frac{1}{2}\times\frac{1}{3}+\frac{1}{4}=\frac{1}{6}+\frac{1}{4}=\frac{2}{12}+\frac{3}{12}=\frac{2+3}{12}=\frac{5}{12}\)

d, Tương tự như câu c

P/S : Bất phương trình????

\(\frac{1}{5}\times\frac{1}{2}:\frac{1}{3}\)

\(=\frac{1}{10}\times\frac{3}{1}\)

\(=\frac{3}{10}\)

\(\frac{1}{2}\)- \(\frac{1}{3}\)x \(\frac{1}{4}\)

= \(\frac{1}{2}\)- \(\frac{1}{12}\)

= \(\frac{6}{12}\)- \(\frac{1}{12}\)

= \(\frac{5}{12}\)

tk nhé

5

12

 kb và k nha

=1/2.3+1/3.4+1/4.5+1/5.6

=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6

=1/2-1/6

=1/3

\(\dfrac{1}{2}+\dfrac{4}{3}\times\dfrac{1}{6}=\dfrac{1}{2}+\dfrac{4}{18}=\dfrac{9}{18}+\dfrac{4}{18}=\dfrac{13}{18}\)

1/2 + 2/9 = 13/18

\(\dfrac{7}{3}\times\dfrac{1}{2}+\dfrac{1}{7}=\dfrac{7}{6}+\dfrac{1}{7}=\dfrac{49}{42}+\dfrac{6}{42}=\dfrac{55}{42}\)

13/42