Phép chia phân số

Gọi chiều rộng là x

Chu vi là 6x

Chiều dài là 6x:2-x=2x

Theo đề, ta có: \(2x^2=128\)

=>x=8

=>2x=16

Chu vi là (8+16)x2=48(cm)

a: \(=\dfrac{4}{7}+\dfrac{2}{19}\cdot\dfrac{7}{3}=\dfrac{4}{7}+\dfrac{14}{57}=\dfrac{326}{399}\)

b: \(=\dfrac{6}{11}\cdot\dfrac{2}{5}-\dfrac{5}{11}=\dfrac{12}{55}-\dfrac{5}{11}=\dfrac{12-25}{55}=\dfrac{-13}{55}\)

c: \(=\dfrac{17}{15}-\dfrac{3}{2}=\dfrac{34-45}{30}=\dfrac{-11}{30}\)

a: =6x5/4=30/4=15/2

b: =8x7/12=56/12=14/3

c: =5x8/7=40/7

d: =15x3/5=9

a: =6x5/4=30/4=15/2

b: =8x7/12=56/12=14/3

c: =5x8/7=40/7

d: =15x3/5=9

\(a,6:\dfrac{4}{5}=6\text{×}\dfrac{5}{4}=\dfrac{30}{4}=\dfrac{15}{2}\)

\(b,8:\dfrac{12}{7}=8\text{×}\dfrac{7}{12}=\dfrac{56}{12}=\dfrac{14}{3}\)

\(c,5:\dfrac{7}{8}=5\text{×}\dfrac{8}{7}=\dfrac{40}{7}\)

\(d,15:\dfrac{5}{3}=15\text{×}\dfrac{3}{5}=\dfrac{45}{5}=9\)

C

C

C

= 5/12x4/3-1/3

= 20/36- 1/3

= 5/9- 1/3

= 5/9- 3/9

= 2/9

`5/12:3/4-1/3`

`=5/12xx4/3-1/3`

`=20/36-1/3`

`=5/9-1/3`

`=2/9`

`@Nae

=87x5/27=145/9

145/9

145/9

Lỗi ảnh rồi

lỗi hình r

lỗi

93/52

\(\left(\dfrac{8}{13}-\dfrac{5}{12}\right):\dfrac{1}{9}=\left(\dfrac{96}{156}-\dfrac{65}{156}\right)\times9=\dfrac{31}{156}\times9=\dfrac{93}{52}\)

giải chi tiết giúp mình

* là chia ?

\(\dfrac{3}{4}:\dfrac{1}{9}\times\dfrac{5}{7}:\dfrac{1}{4}=\dfrac{3}{4}\times9\times\dfrac{5}{7}\times4=\dfrac{135}{7}\)

\(\dfrac{140}{143}\times\dfrac{5}{7}=\dfrac{100}{143}\)

Bạn viết rõ lại tí đc ko

\(\dfrac{7}{3}x\dfrac{1}{2}=\dfrac{7}{6}\)

7/6

\(\dfrac{7}{3}:2=\dfrac{7}{6}\)