\(A=\frac{\frac{1}{3}+\frac{1}{9}-\frac{1}{27}}{\frac{5}{3}+\frac{5}{9}-\frac{5}{27}}\)

\(\Leftrightarrow\frac{\frac{11}{27}}{\frac{55}{27}}\)

\(=\frac{11}{27}.\frac{27}{55}=\frac{1}{5}\)

~~~~~~~~~~~~~
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 A=\(\frac{1}{5}\)

Chúc ban làm bai tốt

A = \(\frac{1}{3}\)+ \(\frac{1}{9}\)-\(\frac{1}{27}\) phần \(\frac{5}{3}\)+\(\frac{5}{9}\)-\(\frac{5}{27}\)

A = 1 . ( 1/3 + 1/9 - 1/27) phần 5 . ( 1/5 + 5/9 - 5/27) ( Gạch bỏ : 1/3 + 1/9 - 1/27)

A = \(\frac{1}{5}\)

\(x-\frac{10}{3}=\frac{7}{15}.\frac{3}{5}\)

\(x-\frac{10}{3}=\frac{7}{25}\)

\(x=\frac{7}{25}+\frac{10}{3}=\frac{271}{75}\)

Vậy x = 271/75

\(x-\frac{10}{3}\)\(=\)\(\frac{7}{15}\)\(.\)\(\frac{3}{5}\)

\(x-\frac{10}{3}\)\(=\)  \(\frac{7}{25}\)

\(x\)             \(=\)\(\frac{7}{25}\)\(+\)\(\frac{10}{3}\)

\(x\)                 \(=\)    \(\frac{271}{75}\)

Trả lời:

x-10/3=7/15.3/5

x-10/3=7/25

x=10/3+7/25

x=271/75

x+3/22=27/121.11/9

x+3/22=3/11

x=3/11-3/22

x=3/22

1/5:x=1/2

x=1/5:1/2

x=1/5.2

x=2/5

3/5+2/5.x=1

2/5.x=1-3/5

2/5.x=2/5

x=2/5:2/5

x=1

a.   =3/8 + 1/2 :(9/16) - 3/16

      =3/8 + 8/9 - 3/16

      =155/144

b.   =7/27*3/2 + 1/2 : 1/6

      =7/18 + 3

      =61/18

a, 3/8+1/2:(1/4+3/8-1/16)-3/16

=3/8+1/2:9/16-3/16

=3/8+8/9-3/16

=91/72-3/16

=155/144

b, (4/9-5/27)*3/2+1/2:(5/18-1/9)

=17/27*3/2+1/2:1/6

=17/18+3

=71/18

tim y

a,60-12+y=36=44

=

=

=

a, 1/2 x ( 2/9 + 3/7 - 5/27 )

= 1/2 x ( 41/63 - 5/27 )

= 1/2 x 88/189

= 44/189

b, (-5/8 + 1,75 + 8/35) : (-3 và 9/10)

= (-5/8 + 7/4 + 8/35) : (-39/10)

= (9/8 + 8/35) : (-39/10)

=379/280 : (-39/10)

= -379/1092

c, 1/3 x 5/7 - 5/27 x 36/14

= 5/21 - 10/21

= -5/21

Chúc bạn học tốt !

a) 1/2 x  (\(\frac{42}{189}-\frac{81}{189}-\frac{35}{189}\))=1/2 x 88/189 = 44/189

b) ( \(\frac{-5}{8}+\frac{7}{4}+\frac{8}{35}\)) : \(-3\frac{9}{10}\)

= ( \(\frac{-175}{280}+\frac{490}{280}+\frac{64}{280}\)) : \(\frac{-39}{10}\)

=\(\frac{379}{280}\)  x \(\frac{-10}{39}\)=\(\frac{-379}{1092}\)

c) \(\frac{5}{21}\)- \(\frac{10}{21}\)= \(\frac{-5}{21}\)

A=-8

B=-62

C=2

D=1

a ] mình thấy bạn hình như ghi sai đề

b ]    x : [ 25 + 417 ] = 138 = x : 442

x = 442 x 138 = 60996

24 x 36 + 18 x 24 + 18 x 45 - 18 x 7 = 18 x 24 x 2 + 18 x 24 + 18 x 45 - 18 x 7 =
18 x ( 48 + 24 + 45 - 7 ) = 18 x 110 = 1980

\(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}=\frac{27+9+3+1}{81}=\frac{40}{81}\)

\(\frac{3}{5}< x< \frac{4}{5}\)  |  \(x=\frac{31}{50}\)

3,5 < x < 3,6 | x = 3,51

\(\frac{9}{27}=-\frac{5}{a}\)

=>-5x27=a x 9

a=-5x27/9

a=-15

-5/15=b/-18

=>-18x5/15=b

b=-6

=7/27*3/2+1/2:1/6

=7/18+3

=61/18

đề sai rồi kìa