a}3/4x2/9+1/3=3x2/4x9+1/3=6/36+1/3=6/36+12/36=18/36=1/2

b}1/4:1/3-1/2=1x3/4x1-1/2=3/4-1/2=3/4-2/4=1/4

                 đáp số : a}1/2

                              b}1/4

A).1/2

B).1/4

k cho mình nha

Đề bài sai nhé!

A, X x 4/8 = 4/8

              x = 4/8 : 4/8

              x = 1

B, 1/9 + x + 1 - 3/18

= 1/9 + 1 + 1 - 3/18

= 35/18

ko kq mk chịu

Tính 

a ) 5/2 x 1/3 + 1/4

= 5/5+1/4

=13/12

b)5/2 +  1/3 x 1/4

= 5/2 + 1/12

= 31/12

c ) 5/2 -1/3 :1/4

= 5/2  - 4/3

= 7/6

tk mk nha ( nếu đúng )

hihi mơn nha !!!!!!!!!!

a. = (5/2x2/3) +1/4

    = 5/3+1/4= 23/12

b. = 5/2+( 1/3x1/4)

    = 5/2+1/12

    =31/12

c. =5/2-( 1/3:1/4)

    = 5/2-4/3

    = 7/6

Bài 1

a 2/5+3/6=12/30+15/30=27/30=9/10 .

b 5/9-1/6=30/54-9/54=21/54=7/18

a) 2/5 + 1/2 + 7/10

= 4/10 + 5/10 + 7/10

= 9/10 + 7/10

= 16/10 = 8/5

b) 4/9 + 11/8 - 5/6

= 32/72 + 99/72 - 60/72

= 191/72

c) 9/20 - 8/15 x 5/12

= 9/20 - 2/9

= 41/180

d) 2/3 : 4/5 : 7/12

= 5/6 : 7/12

= 10/7

a,2/5+1/2+7/10

=4/10+5/10+7/10

=16/10

=8/5

b,4/9+11/8-5/6

=32/72+99/72-5/6

=131/72-5/6

=131/72-60/72

=71/72

c,9/20-8/15x5/12

=9/20-2/9

=41/180

d,2/3:4/5:7/12

=2/5x5/4x12/7

=6/7

Tính 

a ) 1/2 x 1/4 x 1/6 

= 1/8 x 1/6

= 1/48

b ) 1/2 x 1/4 : 1/6

= 1/8:1/6

3/4

c ) 1/2 : 1/4 x 1/6 

= 2 x 1/6

= 1/3

tk mk nha ( nếu đúng )

hihi mơn nha !!!!!!!!!

a, : 1/2 x 1/4 x 1/6 = 1/8 x 1/6 = 1/48

b, ; 1/2 x 1/4 : 1/6 = 1/8 : 1/6 = 6/8 = 3/4

c, 1/2 : 1/4 x 1/6 = 4/2 x 1/6 = 4/12 = 1/3

Câu a:

7/10.4/9 + 3/10.4/9 - 1 7/9

= 4/9.(7/10 + 3/10) - 16/9

= 4/9 - 16/9

= - 12/9

= - 4/3

Câu b:

- 5/6 + 4/9.(5/4 - 2/3).(-3)^2 + 5/9.30%

= - 5/6 + [5/9 - 8/27].9 + 5/9.3/10

= - 5/6 + 5 - 8/3 + 1/6

= (-5/6 + 1/6) - 8/3 + 5

= - 4/6 - 8/3 + 15/3

= - 2/3 - 8/3 + 15/3

= - 10/3 + 15/3

= 5/3

a,\(\frac{7}{10}\cdot\frac{4}{9}+\frac{3}{10}\cdot\frac{4}{9}-1\frac{7}{9}\)

\(=\frac{14}{45}+\frac{2}{15}-\frac{16}{9}\)

\(=\frac{14}{45}+\frac{6}{45}-\frac{80}{45}\)

\(=\frac{-60}{45}=\frac{-4}{3}\)

b,\(\frac{-5}{6}+\frac{4}{9}\cdot\left(\frac{5}{4}-\frac{2}{3}\right)\cdot\left(-3\right)^2+\frac{5}{9}\cdot30\%\)

\(=\frac{-5}{6}+\frac{4}{9}\cdot\left(\frac{7}{12}\right)\cdot9+\frac{5}{9}\cdot\frac{3}{10}\)

\(=\frac{-5}{6}+\frac{7}{3}+\frac{1}{6}\)

\(=\frac{-5}{6}+\frac{14}{6}+\frac{1}{6}\)

=\(=\frac{10}{6}=\frac{5}{3}\)

Câu c:

1/2017.(1/3 - 7/12 + 1/4) - (6 2/3 - 1,5.2^2) :5/6

= 1/2017.(4/12 - 7/12 + 3/12) - (20/3 - 1,5x 4) : 5/6

= 1/2017.0 - (20/3 - 6) x 6/5

= 0 - (20/3 - 18/3) x 6/5

= - 2/3 x 6/5

= - 4/5

a,3/7 : 5/8 = 24/56 : 35/56 = 24/35

b, 8/7 : 3/4 = 32/28 : 21/28 = 32/21

c, 1/3: 1/2 = 2/6 : 3/6 =2/3